1735 lines
66 KiB
Rust
1735 lines
66 KiB
Rust
use crate::abi::{Abi, FnAbi, LlvmType, PassMode};
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use crate::builder::Builder;
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use crate::context::CodegenCx;
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use crate::llvm;
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use crate::type_::Type;
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use crate::type_of::LayoutLlvmExt;
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use crate::va_arg::emit_va_arg;
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use crate::value::Value;
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use rustc_codegen_ssa::base::{compare_simd_types, wants_msvc_seh};
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use rustc_codegen_ssa::common::span_invalid_monomorphization_error;
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use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
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use rustc_codegen_ssa::mir::operand::OperandRef;
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use rustc_codegen_ssa::mir::place::PlaceRef;
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use rustc_codegen_ssa::traits::*;
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use rustc_hir as hir;
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use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};
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use rustc_middle::ty::{self, Ty};
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use rustc_middle::{bug, span_bug};
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use rustc_span::{sym, symbol::kw, Span, Symbol};
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use rustc_target::abi::{self, HasDataLayout, LayoutOf, Primitive};
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use rustc_target::spec::PanicStrategy;
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use std::cmp::Ordering;
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use std::iter;
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fn get_simple_intrinsic(cx: &CodegenCx<'ll, '_>, name: Symbol) -> Option<&'ll Value> {
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let llvm_name = match name {
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sym::sqrtf32 => "llvm.sqrt.f32",
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sym::sqrtf64 => "llvm.sqrt.f64",
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sym::powif32 => "llvm.powi.f32",
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sym::powif64 => "llvm.powi.f64",
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sym::sinf32 => "llvm.sin.f32",
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sym::sinf64 => "llvm.sin.f64",
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sym::cosf32 => "llvm.cos.f32",
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sym::cosf64 => "llvm.cos.f64",
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sym::powf32 => "llvm.pow.f32",
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sym::powf64 => "llvm.pow.f64",
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sym::expf32 => "llvm.exp.f32",
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sym::expf64 => "llvm.exp.f64",
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sym::exp2f32 => "llvm.exp2.f32",
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sym::exp2f64 => "llvm.exp2.f64",
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sym::logf32 => "llvm.log.f32",
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sym::logf64 => "llvm.log.f64",
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sym::log10f32 => "llvm.log10.f32",
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sym::log10f64 => "llvm.log10.f64",
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sym::log2f32 => "llvm.log2.f32",
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sym::log2f64 => "llvm.log2.f64",
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sym::fmaf32 => "llvm.fma.f32",
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sym::fmaf64 => "llvm.fma.f64",
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sym::fabsf32 => "llvm.fabs.f32",
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sym::fabsf64 => "llvm.fabs.f64",
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sym::minnumf32 => "llvm.minnum.f32",
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sym::minnumf64 => "llvm.minnum.f64",
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sym::maxnumf32 => "llvm.maxnum.f32",
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sym::maxnumf64 => "llvm.maxnum.f64",
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sym::copysignf32 => "llvm.copysign.f32",
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sym::copysignf64 => "llvm.copysign.f64",
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sym::floorf32 => "llvm.floor.f32",
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sym::floorf64 => "llvm.floor.f64",
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sym::ceilf32 => "llvm.ceil.f32",
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sym::ceilf64 => "llvm.ceil.f64",
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sym::truncf32 => "llvm.trunc.f32",
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sym::truncf64 => "llvm.trunc.f64",
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sym::rintf32 => "llvm.rint.f32",
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sym::rintf64 => "llvm.rint.f64",
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sym::nearbyintf32 => "llvm.nearbyint.f32",
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sym::nearbyintf64 => "llvm.nearbyint.f64",
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sym::roundf32 => "llvm.round.f32",
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sym::roundf64 => "llvm.round.f64",
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_ => return None,
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};
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Some(cx.get_intrinsic(&llvm_name))
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}
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impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
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fn codegen_intrinsic_call(
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&mut self,
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instance: ty::Instance<'tcx>,
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fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
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args: &[OperandRef<'tcx, &'ll Value>],
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llresult: &'ll Value,
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span: Span,
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) {
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let tcx = self.tcx;
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let callee_ty = instance.ty(tcx, ty::ParamEnv::reveal_all());
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let (def_id, substs) = match *callee_ty.kind() {
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ty::FnDef(def_id, substs) => (def_id, substs),
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_ => bug!("expected fn item type, found {}", callee_ty),
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};
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let sig = callee_ty.fn_sig(tcx);
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let sig = tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), sig);
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let arg_tys = sig.inputs();
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let ret_ty = sig.output();
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let name = tcx.item_name(def_id);
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let name_str = &*name.as_str();
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let llret_ty = self.layout_of(ret_ty).llvm_type(self);
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let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
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let simple = get_simple_intrinsic(self, name);
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let llval = match name {
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_ if simple.is_some() => self.call(
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simple.unwrap(),
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&args.iter().map(|arg| arg.immediate()).collect::<Vec<_>>(),
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None,
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),
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sym::likely => {
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let expect = self.get_intrinsic(&("llvm.expect.i1"));
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self.call(expect, &[args[0].immediate(), self.const_bool(true)], None)
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}
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sym::unlikely => {
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let expect = self.get_intrinsic(&("llvm.expect.i1"));
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self.call(expect, &[args[0].immediate(), self.const_bool(false)], None)
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}
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kw::Try => {
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try_intrinsic(
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self,
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args[0].immediate(),
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args[1].immediate(),
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args[2].immediate(),
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llresult,
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);
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return;
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}
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sym::breakpoint => {
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let llfn = self.get_intrinsic(&("llvm.debugtrap"));
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self.call(llfn, &[], None)
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}
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sym::va_copy => {
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let intrinsic = self.cx().get_intrinsic(&("llvm.va_copy"));
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self.call(intrinsic, &[args[0].immediate(), args[1].immediate()], None)
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}
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sym::va_arg => {
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match fn_abi.ret.layout.abi {
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abi::Abi::Scalar(ref scalar) => {
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match scalar.value {
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Primitive::Int(..) => {
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if self.cx().size_of(ret_ty).bytes() < 4 {
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// `va_arg` should not be called on a integer type
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// less than 4 bytes in length. If it is, promote
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// the integer to a `i32` and truncate the result
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// back to the smaller type.
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let promoted_result = emit_va_arg(self, args[0], tcx.types.i32);
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self.trunc(promoted_result, llret_ty)
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} else {
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emit_va_arg(self, args[0], ret_ty)
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}
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}
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Primitive::F64 | Primitive::Pointer => {
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emit_va_arg(self, args[0], ret_ty)
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}
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// `va_arg` should never be used with the return type f32.
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Primitive::F32 => bug!("the va_arg intrinsic does not work with `f32`"),
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}
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}
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_ => bug!("the va_arg intrinsic does not work with non-scalar types"),
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}
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}
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sym::volatile_load | sym::unaligned_volatile_load => {
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let tp_ty = substs.type_at(0);
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let mut ptr = args[0].immediate();
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if let PassMode::Cast(ty) = fn_abi.ret.mode {
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ptr = self.pointercast(ptr, self.type_ptr_to(ty.llvm_type(self)));
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}
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let load = self.volatile_load(ptr);
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let align = if name == sym::unaligned_volatile_load {
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1
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} else {
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self.align_of(tp_ty).bytes() as u32
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};
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unsafe {
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llvm::LLVMSetAlignment(load, align);
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}
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self.to_immediate(load, self.layout_of(tp_ty))
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}
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sym::volatile_store => {
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let dst = args[0].deref(self.cx());
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args[1].val.volatile_store(self, dst);
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return;
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}
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sym::unaligned_volatile_store => {
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let dst = args[0].deref(self.cx());
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args[1].val.unaligned_volatile_store(self, dst);
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return;
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}
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sym::prefetch_read_data
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| sym::prefetch_write_data
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| sym::prefetch_read_instruction
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| sym::prefetch_write_instruction => {
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let expect = self.get_intrinsic(&("llvm.prefetch"));
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let (rw, cache_type) = match name {
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sym::prefetch_read_data => (0, 1),
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sym::prefetch_write_data => (1, 1),
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sym::prefetch_read_instruction => (0, 0),
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sym::prefetch_write_instruction => (1, 0),
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_ => bug!(),
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};
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self.call(
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expect,
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&[
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args[0].immediate(),
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self.const_i32(rw),
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args[1].immediate(),
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self.const_i32(cache_type),
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],
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None,
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)
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}
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sym::ctlz
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| sym::ctlz_nonzero
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| sym::cttz
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| sym::cttz_nonzero
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| sym::ctpop
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| sym::bswap
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| sym::bitreverse
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| sym::rotate_left
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| sym::rotate_right
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| sym::saturating_add
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| sym::saturating_sub => {
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let ty = arg_tys[0];
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match int_type_width_signed(ty, self) {
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Some((width, signed)) => match name {
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sym::ctlz | sym::cttz => {
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let y = self.const_bool(false);
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let llfn = self.get_intrinsic(&format!("llvm.{}.i{}", name, width));
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self.call(llfn, &[args[0].immediate(), y], None)
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}
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sym::ctlz_nonzero | sym::cttz_nonzero => {
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let y = self.const_bool(true);
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let llvm_name = &format!("llvm.{}.i{}", &name_str[..4], width);
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let llfn = self.get_intrinsic(llvm_name);
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self.call(llfn, &[args[0].immediate(), y], None)
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}
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sym::ctpop => self.call(
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self.get_intrinsic(&format!("llvm.ctpop.i{}", width)),
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&[args[0].immediate()],
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None,
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),
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sym::bswap => {
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if width == 8 {
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args[0].immediate() // byte swap a u8/i8 is just a no-op
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} else {
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self.call(
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self.get_intrinsic(&format!("llvm.bswap.i{}", width)),
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&[args[0].immediate()],
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None,
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)
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}
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}
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sym::bitreverse => self.call(
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self.get_intrinsic(&format!("llvm.bitreverse.i{}", width)),
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&[args[0].immediate()],
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None,
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),
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sym::rotate_left | sym::rotate_right => {
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let is_left = name == sym::rotate_left;
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let val = args[0].immediate();
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let raw_shift = args[1].immediate();
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// rotate = funnel shift with first two args the same
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let llvm_name =
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&format!("llvm.fsh{}.i{}", if is_left { 'l' } else { 'r' }, width);
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let llfn = self.get_intrinsic(llvm_name);
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self.call(llfn, &[val, val, raw_shift], None)
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}
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sym::saturating_add | sym::saturating_sub => {
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let is_add = name == sym::saturating_add;
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let lhs = args[0].immediate();
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let rhs = args[1].immediate();
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||
let llvm_name = &format!(
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"llvm.{}{}.sat.i{}",
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if signed { 's' } else { 'u' },
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if is_add { "add" } else { "sub" },
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width
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||
);
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let llfn = self.get_intrinsic(llvm_name);
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self.call(llfn, &[lhs, rhs], None)
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}
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_ => bug!(),
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||
},
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||
None => {
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||
span_invalid_monomorphization_error(
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tcx.sess,
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span,
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&format!(
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"invalid monomorphization of `{}` intrinsic: \
|
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expected basic integer type, found `{}`",
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||
name, ty
|
||
),
|
||
);
|
||
return;
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||
}
|
||
}
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||
}
|
||
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||
_ if name_str.starts_with("simd_") => {
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||
match generic_simd_intrinsic(self, name, callee_ty, args, ret_ty, llret_ty, span) {
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||
Ok(llval) => llval,
|
||
Err(()) => return,
|
||
}
|
||
}
|
||
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||
_ => bug!("unknown intrinsic '{}'", name),
|
||
};
|
||
|
||
if !fn_abi.ret.is_ignore() {
|
||
if let PassMode::Cast(ty) = fn_abi.ret.mode {
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||
let ptr_llty = self.type_ptr_to(ty.llvm_type(self));
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||
let ptr = self.pointercast(result.llval, ptr_llty);
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||
self.store(llval, ptr, result.align);
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} else {
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||
OperandRef::from_immediate_or_packed_pair(self, llval, result.layout)
|
||
.val
|
||
.store(self, result);
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||
}
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||
}
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||
}
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||
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||
fn abort(&mut self) {
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||
let fnname = self.get_intrinsic(&("llvm.trap"));
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||
self.call(fnname, &[], None);
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||
}
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||
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||
fn assume(&mut self, val: Self::Value) {
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||
let assume_intrinsic = self.get_intrinsic("llvm.assume");
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||
self.call(assume_intrinsic, &[val], None);
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||
}
|
||
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||
fn expect(&mut self, cond: Self::Value, expected: bool) -> Self::Value {
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||
let expect = self.get_intrinsic(&"llvm.expect.i1");
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self.call(expect, &[cond, self.const_bool(expected)], None)
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||
}
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||
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||
fn sideeffect(&mut self) {
|
||
// This kind of check would make a ton of sense in the caller, but currently the only
|
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// caller of this function is in `rustc_codegen_ssa`, which is agnostic to whether LLVM
|
||
// codegen backend being used, and so is unable to check the LLVM version.
|
||
if unsafe { llvm::LLVMRustVersionMajor() } < 12 {
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||
let fnname = self.get_intrinsic(&("llvm.sideeffect"));
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||
self.call(fnname, &[], None);
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||
}
|
||
}
|
||
|
||
fn va_start(&mut self, va_list: &'ll Value) -> &'ll Value {
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||
let intrinsic = self.cx().get_intrinsic("llvm.va_start");
|
||
self.call(intrinsic, &[va_list], None)
|
||
}
|
||
|
||
fn va_end(&mut self, va_list: &'ll Value) -> &'ll Value {
|
||
let intrinsic = self.cx().get_intrinsic("llvm.va_end");
|
||
self.call(intrinsic, &[va_list], None)
|
||
}
|
||
}
|
||
|
||
fn try_intrinsic(
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
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try_func: &'ll Value,
|
||
data: &'ll Value,
|
||
catch_func: &'ll Value,
|
||
dest: &'ll Value,
|
||
) {
|
||
if bx.sess().panic_strategy() == PanicStrategy::Abort {
|
||
bx.call(try_func, &[data], None);
|
||
// Return 0 unconditionally from the intrinsic call;
|
||
// we can never unwind.
|
||
let ret_align = bx.tcx().data_layout.i32_align.abi;
|
||
bx.store(bx.const_i32(0), dest, ret_align);
|
||
} else if wants_msvc_seh(bx.sess()) {
|
||
codegen_msvc_try(bx, try_func, data, catch_func, dest);
|
||
} else if bx.sess().target.is_like_emscripten {
|
||
codegen_emcc_try(bx, try_func, data, catch_func, dest);
|
||
} else {
|
||
codegen_gnu_try(bx, try_func, data, catch_func, dest);
|
||
}
|
||
}
|
||
|
||
// MSVC's definition of the `rust_try` function.
|
||
//
|
||
// This implementation uses the new exception handling instructions in LLVM
|
||
// which have support in LLVM for SEH on MSVC targets. Although these
|
||
// instructions are meant to work for all targets, as of the time of this
|
||
// writing, however, LLVM does not recommend the usage of these new instructions
|
||
// as the old ones are still more optimized.
|
||
fn codegen_msvc_try(
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
||
try_func: &'ll Value,
|
||
data: &'ll Value,
|
||
catch_func: &'ll Value,
|
||
dest: &'ll Value,
|
||
) {
|
||
let llfn = get_rust_try_fn(bx, &mut |mut bx| {
|
||
bx.set_personality_fn(bx.eh_personality());
|
||
|
||
let mut normal = bx.build_sibling_block("normal");
|
||
let mut catchswitch = bx.build_sibling_block("catchswitch");
|
||
let mut catchpad_rust = bx.build_sibling_block("catchpad_rust");
|
||
let mut catchpad_foreign = bx.build_sibling_block("catchpad_foreign");
|
||
let mut caught = bx.build_sibling_block("caught");
|
||
|
||
let try_func = llvm::get_param(bx.llfn(), 0);
|
||
let data = llvm::get_param(bx.llfn(), 1);
|
||
let catch_func = llvm::get_param(bx.llfn(), 2);
|
||
|
||
// We're generating an IR snippet that looks like:
|
||
//
|
||
// declare i32 @rust_try(%try_func, %data, %catch_func) {
|
||
// %slot = alloca i8*
|
||
// invoke %try_func(%data) to label %normal unwind label %catchswitch
|
||
//
|
||
// normal:
|
||
// ret i32 0
|
||
//
|
||
// catchswitch:
|
||
// %cs = catchswitch within none [%catchpad_rust, %catchpad_foreign] unwind to caller
|
||
//
|
||
// catchpad_rust:
|
||
// %tok = catchpad within %cs [%type_descriptor, 8, %slot]
|
||
// %ptr = load %slot
|
||
// call %catch_func(%data, %ptr)
|
||
// catchret from %tok to label %caught
|
||
//
|
||
// catchpad_foreign:
|
||
// %tok = catchpad within %cs [null, 64, null]
|
||
// call %catch_func(%data, null)
|
||
// catchret from %tok to label %caught
|
||
//
|
||
// caught:
|
||
// ret i32 1
|
||
// }
|
||
//
|
||
// This structure follows the basic usage of throw/try/catch in LLVM.
|
||
// For example, compile this C++ snippet to see what LLVM generates:
|
||
//
|
||
// struct rust_panic {
|
||
// rust_panic(const rust_panic&);
|
||
// ~rust_panic();
|
||
//
|
||
// void* x[2];
|
||
// };
|
||
//
|
||
// int __rust_try(
|
||
// void (*try_func)(void*),
|
||
// void *data,
|
||
// void (*catch_func)(void*, void*) noexcept
|
||
// ) {
|
||
// try {
|
||
// try_func(data);
|
||
// return 0;
|
||
// } catch(rust_panic& a) {
|
||
// catch_func(data, &a);
|
||
// return 1;
|
||
// } catch(...) {
|
||
// catch_func(data, NULL);
|
||
// return 1;
|
||
// }
|
||
// }
|
||
//
|
||
// More information can be found in libstd's seh.rs implementation.
|
||
let ptr_align = bx.tcx().data_layout.pointer_align.abi;
|
||
let slot = bx.alloca(bx.type_i8p(), ptr_align);
|
||
bx.invoke(try_func, &[data], normal.llbb(), catchswitch.llbb(), None);
|
||
|
||
normal.ret(bx.const_i32(0));
|
||
|
||
let cs = catchswitch.catch_switch(None, None, 2);
|
||
catchswitch.add_handler(cs, catchpad_rust.llbb());
|
||
catchswitch.add_handler(cs, catchpad_foreign.llbb());
|
||
|
||
// We can't use the TypeDescriptor defined in libpanic_unwind because it
|
||
// might be in another DLL and the SEH encoding only supports specifying
|
||
// a TypeDescriptor from the current module.
|
||
//
|
||
// However this isn't an issue since the MSVC runtime uses string
|
||
// comparison on the type name to match TypeDescriptors rather than
|
||
// pointer equality.
|
||
//
|
||
// So instead we generate a new TypeDescriptor in each module that uses
|
||
// `try` and let the linker merge duplicate definitions in the same
|
||
// module.
|
||
//
|
||
// When modifying, make sure that the type_name string exactly matches
|
||
// the one used in src/libpanic_unwind/seh.rs.
|
||
let type_info_vtable = bx.declare_global("??_7type_info@@6B@", bx.type_i8p());
|
||
let type_name = bx.const_bytes(b"rust_panic\0");
|
||
let type_info =
|
||
bx.const_struct(&[type_info_vtable, bx.const_null(bx.type_i8p()), type_name], false);
|
||
let tydesc = bx.declare_global("__rust_panic_type_info", bx.val_ty(type_info));
|
||
unsafe {
|
||
llvm::LLVMRustSetLinkage(tydesc, llvm::Linkage::LinkOnceODRLinkage);
|
||
llvm::SetUniqueComdat(bx.llmod, tydesc);
|
||
llvm::LLVMSetInitializer(tydesc, type_info);
|
||
}
|
||
|
||
// The flag value of 8 indicates that we are catching the exception by
|
||
// reference instead of by value. We can't use catch by value because
|
||
// that requires copying the exception object, which we don't support
|
||
// since our exception object effectively contains a Box.
|
||
//
|
||
// Source: MicrosoftCXXABI::getAddrOfCXXCatchHandlerType in clang
|
||
let flags = bx.const_i32(8);
|
||
let funclet = catchpad_rust.catch_pad(cs, &[tydesc, flags, slot]);
|
||
let ptr = catchpad_rust.load(slot, ptr_align);
|
||
catchpad_rust.call(catch_func, &[data, ptr], Some(&funclet));
|
||
catchpad_rust.catch_ret(&funclet, caught.llbb());
|
||
|
||
// The flag value of 64 indicates a "catch-all".
|
||
let flags = bx.const_i32(64);
|
||
let null = bx.const_null(bx.type_i8p());
|
||
let funclet = catchpad_foreign.catch_pad(cs, &[null, flags, null]);
|
||
catchpad_foreign.call(catch_func, &[data, null], Some(&funclet));
|
||
catchpad_foreign.catch_ret(&funclet, caught.llbb());
|
||
|
||
caught.ret(bx.const_i32(1));
|
||
});
|
||
|
||
// Note that no invoke is used here because by definition this function
|
||
// can't panic (that's what it's catching).
|
||
let ret = bx.call(llfn, &[try_func, data, catch_func], None);
|
||
let i32_align = bx.tcx().data_layout.i32_align.abi;
|
||
bx.store(ret, dest, i32_align);
|
||
}
|
||
|
||
// Definition of the standard `try` function for Rust using the GNU-like model
|
||
// of exceptions (e.g., the normal semantics of LLVM's `landingpad` and `invoke`
|
||
// instructions).
|
||
//
|
||
// This codegen is a little surprising because we always call a shim
|
||
// function instead of inlining the call to `invoke` manually here. This is done
|
||
// because in LLVM we're only allowed to have one personality per function
|
||
// definition. The call to the `try` intrinsic is being inlined into the
|
||
// function calling it, and that function may already have other personality
|
||
// functions in play. By calling a shim we're guaranteed that our shim will have
|
||
// the right personality function.
|
||
fn codegen_gnu_try(
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
||
try_func: &'ll Value,
|
||
data: &'ll Value,
|
||
catch_func: &'ll Value,
|
||
dest: &'ll Value,
|
||
) {
|
||
let llfn = get_rust_try_fn(bx, &mut |mut bx| {
|
||
// Codegens the shims described above:
|
||
//
|
||
// bx:
|
||
// invoke %try_func(%data) normal %normal unwind %catch
|
||
//
|
||
// normal:
|
||
// ret 0
|
||
//
|
||
// catch:
|
||
// (%ptr, _) = landingpad
|
||
// call %catch_func(%data, %ptr)
|
||
// ret 1
|
||
let mut then = bx.build_sibling_block("then");
|
||
let mut catch = bx.build_sibling_block("catch");
|
||
|
||
let try_func = llvm::get_param(bx.llfn(), 0);
|
||
let data = llvm::get_param(bx.llfn(), 1);
|
||
let catch_func = llvm::get_param(bx.llfn(), 2);
|
||
bx.invoke(try_func, &[data], then.llbb(), catch.llbb(), None);
|
||
then.ret(bx.const_i32(0));
|
||
|
||
// Type indicator for the exception being thrown.
|
||
//
|
||
// The first value in this tuple is a pointer to the exception object
|
||
// being thrown. The second value is a "selector" indicating which of
|
||
// the landing pad clauses the exception's type had been matched to.
|
||
// rust_try ignores the selector.
|
||
let lpad_ty = bx.type_struct(&[bx.type_i8p(), bx.type_i32()], false);
|
||
let vals = catch.landing_pad(lpad_ty, bx.eh_personality(), 1);
|
||
let tydesc = bx.const_null(bx.type_i8p());
|
||
catch.add_clause(vals, tydesc);
|
||
let ptr = catch.extract_value(vals, 0);
|
||
catch.call(catch_func, &[data, ptr], None);
|
||
catch.ret(bx.const_i32(1));
|
||
});
|
||
|
||
// Note that no invoke is used here because by definition this function
|
||
// can't panic (that's what it's catching).
|
||
let ret = bx.call(llfn, &[try_func, data, catch_func], None);
|
||
let i32_align = bx.tcx().data_layout.i32_align.abi;
|
||
bx.store(ret, dest, i32_align);
|
||
}
|
||
|
||
// Variant of codegen_gnu_try used for emscripten where Rust panics are
|
||
// implemented using C++ exceptions. Here we use exceptions of a specific type
|
||
// (`struct rust_panic`) to represent Rust panics.
|
||
fn codegen_emcc_try(
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
||
try_func: &'ll Value,
|
||
data: &'ll Value,
|
||
catch_func: &'ll Value,
|
||
dest: &'ll Value,
|
||
) {
|
||
let llfn = get_rust_try_fn(bx, &mut |mut bx| {
|
||
// Codegens the shims described above:
|
||
//
|
||
// bx:
|
||
// invoke %try_func(%data) normal %normal unwind %catch
|
||
//
|
||
// normal:
|
||
// ret 0
|
||
//
|
||
// catch:
|
||
// (%ptr, %selector) = landingpad
|
||
// %rust_typeid = @llvm.eh.typeid.for(@_ZTI10rust_panic)
|
||
// %is_rust_panic = %selector == %rust_typeid
|
||
// %catch_data = alloca { i8*, i8 }
|
||
// %catch_data[0] = %ptr
|
||
// %catch_data[1] = %is_rust_panic
|
||
// call %catch_func(%data, %catch_data)
|
||
// ret 1
|
||
let mut then = bx.build_sibling_block("then");
|
||
let mut catch = bx.build_sibling_block("catch");
|
||
|
||
let try_func = llvm::get_param(bx.llfn(), 0);
|
||
let data = llvm::get_param(bx.llfn(), 1);
|
||
let catch_func = llvm::get_param(bx.llfn(), 2);
|
||
bx.invoke(try_func, &[data], then.llbb(), catch.llbb(), None);
|
||
then.ret(bx.const_i32(0));
|
||
|
||
// Type indicator for the exception being thrown.
|
||
//
|
||
// The first value in this tuple is a pointer to the exception object
|
||
// being thrown. The second value is a "selector" indicating which of
|
||
// the landing pad clauses the exception's type had been matched to.
|
||
let tydesc = bx.eh_catch_typeinfo();
|
||
let lpad_ty = bx.type_struct(&[bx.type_i8p(), bx.type_i32()], false);
|
||
let vals = catch.landing_pad(lpad_ty, bx.eh_personality(), 2);
|
||
catch.add_clause(vals, tydesc);
|
||
catch.add_clause(vals, bx.const_null(bx.type_i8p()));
|
||
let ptr = catch.extract_value(vals, 0);
|
||
let selector = catch.extract_value(vals, 1);
|
||
|
||
// Check if the typeid we got is the one for a Rust panic.
|
||
let llvm_eh_typeid_for = bx.get_intrinsic("llvm.eh.typeid.for");
|
||
let rust_typeid = catch.call(llvm_eh_typeid_for, &[tydesc], None);
|
||
let is_rust_panic = catch.icmp(IntPredicate::IntEQ, selector, rust_typeid);
|
||
let is_rust_panic = catch.zext(is_rust_panic, bx.type_bool());
|
||
|
||
// We need to pass two values to catch_func (ptr and is_rust_panic), so
|
||
// create an alloca and pass a pointer to that.
|
||
let ptr_align = bx.tcx().data_layout.pointer_align.abi;
|
||
let i8_align = bx.tcx().data_layout.i8_align.abi;
|
||
let catch_data =
|
||
catch.alloca(bx.type_struct(&[bx.type_i8p(), bx.type_bool()], false), ptr_align);
|
||
let catch_data_0 = catch.inbounds_gep(catch_data, &[bx.const_usize(0), bx.const_usize(0)]);
|
||
catch.store(ptr, catch_data_0, ptr_align);
|
||
let catch_data_1 = catch.inbounds_gep(catch_data, &[bx.const_usize(0), bx.const_usize(1)]);
|
||
catch.store(is_rust_panic, catch_data_1, i8_align);
|
||
let catch_data = catch.bitcast(catch_data, bx.type_i8p());
|
||
|
||
catch.call(catch_func, &[data, catch_data], None);
|
||
catch.ret(bx.const_i32(1));
|
||
});
|
||
|
||
// Note that no invoke is used here because by definition this function
|
||
// can't panic (that's what it's catching).
|
||
let ret = bx.call(llfn, &[try_func, data, catch_func], None);
|
||
let i32_align = bx.tcx().data_layout.i32_align.abi;
|
||
bx.store(ret, dest, i32_align);
|
||
}
|
||
|
||
// Helper function to give a Block to a closure to codegen a shim function.
|
||
// This is currently primarily used for the `try` intrinsic functions above.
|
||
fn gen_fn<'ll, 'tcx>(
|
||
cx: &CodegenCx<'ll, 'tcx>,
|
||
name: &str,
|
||
rust_fn_sig: ty::PolyFnSig<'tcx>,
|
||
codegen: &mut dyn FnMut(Builder<'_, 'll, 'tcx>),
|
||
) -> &'ll Value {
|
||
let fn_abi = FnAbi::of_fn_ptr(cx, rust_fn_sig, &[]);
|
||
let llfn = cx.declare_fn(name, &fn_abi);
|
||
cx.set_frame_pointer_elimination(llfn);
|
||
cx.apply_target_cpu_attr(llfn);
|
||
// FIXME(eddyb) find a nicer way to do this.
|
||
unsafe { llvm::LLVMRustSetLinkage(llfn, llvm::Linkage::InternalLinkage) };
|
||
let bx = Builder::new_block(cx, llfn, "entry-block");
|
||
codegen(bx);
|
||
llfn
|
||
}
|
||
|
||
// Helper function used to get a handle to the `__rust_try` function used to
|
||
// catch exceptions.
|
||
//
|
||
// This function is only generated once and is then cached.
|
||
fn get_rust_try_fn<'ll, 'tcx>(
|
||
cx: &CodegenCx<'ll, 'tcx>,
|
||
codegen: &mut dyn FnMut(Builder<'_, 'll, 'tcx>),
|
||
) -> &'ll Value {
|
||
if let Some(llfn) = cx.rust_try_fn.get() {
|
||
return llfn;
|
||
}
|
||
|
||
// Define the type up front for the signature of the rust_try function.
|
||
let tcx = cx.tcx;
|
||
let i8p = tcx.mk_mut_ptr(tcx.types.i8);
|
||
// `unsafe fn(*mut i8) -> ()`
|
||
let try_fn_ty = tcx.mk_fn_ptr(ty::Binder::dummy(tcx.mk_fn_sig(
|
||
iter::once(i8p),
|
||
tcx.mk_unit(),
|
||
false,
|
||
hir::Unsafety::Unsafe,
|
||
Abi::Rust,
|
||
)));
|
||
// `unsafe fn(*mut i8, *mut i8) -> ()`
|
||
let catch_fn_ty = tcx.mk_fn_ptr(ty::Binder::dummy(tcx.mk_fn_sig(
|
||
[i8p, i8p].iter().cloned(),
|
||
tcx.mk_unit(),
|
||
false,
|
||
hir::Unsafety::Unsafe,
|
||
Abi::Rust,
|
||
)));
|
||
// `unsafe fn(unsafe fn(*mut i8) -> (), *mut i8, unsafe fn(*mut i8, *mut i8) -> ()) -> i32`
|
||
let rust_fn_sig = ty::Binder::dummy(cx.tcx.mk_fn_sig(
|
||
vec![try_fn_ty, i8p, catch_fn_ty].into_iter(),
|
||
tcx.types.i32,
|
||
false,
|
||
hir::Unsafety::Unsafe,
|
||
Abi::Rust,
|
||
));
|
||
let rust_try = gen_fn(cx, "__rust_try", rust_fn_sig, codegen);
|
||
cx.rust_try_fn.set(Some(rust_try));
|
||
rust_try
|
||
}
|
||
|
||
fn generic_simd_intrinsic(
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
||
name: Symbol,
|
||
callee_ty: Ty<'tcx>,
|
||
args: &[OperandRef<'tcx, &'ll Value>],
|
||
ret_ty: Ty<'tcx>,
|
||
llret_ty: &'ll Type,
|
||
span: Span,
|
||
) -> Result<&'ll Value, ()> {
|
||
// macros for error handling:
|
||
macro_rules! emit_error {
|
||
($msg: tt) => {
|
||
emit_error!($msg, )
|
||
};
|
||
($msg: tt, $($fmt: tt)*) => {
|
||
span_invalid_monomorphization_error(
|
||
bx.sess(), span,
|
||
&format!(concat!("invalid monomorphization of `{}` intrinsic: ", $msg),
|
||
name, $($fmt)*));
|
||
}
|
||
}
|
||
|
||
macro_rules! return_error {
|
||
($($fmt: tt)*) => {
|
||
{
|
||
emit_error!($($fmt)*);
|
||
return Err(());
|
||
}
|
||
}
|
||
}
|
||
|
||
macro_rules! require {
|
||
($cond: expr, $($fmt: tt)*) => {
|
||
if !$cond {
|
||
return_error!($($fmt)*);
|
||
}
|
||
};
|
||
}
|
||
|
||
macro_rules! require_simd {
|
||
($ty: expr, $position: expr) => {
|
||
require!($ty.is_simd(), "expected SIMD {} type, found non-SIMD `{}`", $position, $ty)
|
||
};
|
||
}
|
||
|
||
let tcx = bx.tcx();
|
||
let sig =
|
||
tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), callee_ty.fn_sig(tcx));
|
||
let arg_tys = sig.inputs();
|
||
let name_str = &*name.as_str();
|
||
|
||
if name == sym::simd_select_bitmask {
|
||
let in_ty = arg_tys[0];
|
||
let m_len = match in_ty.kind() {
|
||
// Note that this `.unwrap()` crashes for isize/usize, that's sort
|
||
// of intentional as there's not currently a use case for that.
|
||
ty::Int(i) => i.bit_width().unwrap(),
|
||
ty::Uint(i) => i.bit_width().unwrap(),
|
||
_ => return_error!("`{}` is not an integral type", in_ty),
|
||
};
|
||
require_simd!(arg_tys[1], "argument");
|
||
let (v_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
require!(
|
||
// Allow masks for vectors with fewer than 8 elements to be
|
||
// represented with a u8 or i8.
|
||
m_len == v_len || (m_len == 8 && v_len < 8),
|
||
"mismatched lengths: mask length `{}` != other vector length `{}`",
|
||
m_len,
|
||
v_len
|
||
);
|
||
let i1 = bx.type_i1();
|
||
let im = bx.type_ix(v_len);
|
||
let i1xn = bx.type_vector(i1, v_len);
|
||
let m_im = bx.trunc(args[0].immediate(), im);
|
||
let m_i1s = bx.bitcast(m_im, i1xn);
|
||
return Ok(bx.select(m_i1s, args[1].immediate(), args[2].immediate()));
|
||
}
|
||
|
||
// every intrinsic below takes a SIMD vector as its first argument
|
||
require_simd!(arg_tys[0], "input");
|
||
let in_ty = arg_tys[0];
|
||
|
||
let comparison = match name {
|
||
sym::simd_eq => Some(hir::BinOpKind::Eq),
|
||
sym::simd_ne => Some(hir::BinOpKind::Ne),
|
||
sym::simd_lt => Some(hir::BinOpKind::Lt),
|
||
sym::simd_le => Some(hir::BinOpKind::Le),
|
||
sym::simd_gt => Some(hir::BinOpKind::Gt),
|
||
sym::simd_ge => Some(hir::BinOpKind::Ge),
|
||
_ => None,
|
||
};
|
||
|
||
let (in_len, in_elem) = arg_tys[0].simd_size_and_type(bx.tcx());
|
||
if let Some(cmp_op) = comparison {
|
||
require_simd!(ret_ty, "return");
|
||
|
||
let (out_len, out_ty) = ret_ty.simd_size_and_type(bx.tcx());
|
||
require!(
|
||
in_len == out_len,
|
||
"expected return type with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
in_len,
|
||
in_ty,
|
||
ret_ty,
|
||
out_len
|
||
);
|
||
require!(
|
||
bx.type_kind(bx.element_type(llret_ty)) == TypeKind::Integer,
|
||
"expected return type with integer elements, found `{}` with non-integer `{}`",
|
||
ret_ty,
|
||
out_ty
|
||
);
|
||
|
||
return Ok(compare_simd_types(
|
||
bx,
|
||
args[0].immediate(),
|
||
args[1].immediate(),
|
||
in_elem,
|
||
llret_ty,
|
||
cmp_op,
|
||
));
|
||
}
|
||
|
||
if let Some(stripped) = name_str.strip_prefix("simd_shuffle") {
|
||
let n: u64 = stripped.parse().unwrap_or_else(|_| {
|
||
span_bug!(span, "bad `simd_shuffle` instruction only caught in codegen?")
|
||
});
|
||
|
||
require_simd!(ret_ty, "return");
|
||
|
||
let (out_len, out_ty) = ret_ty.simd_size_and_type(bx.tcx());
|
||
require!(
|
||
out_len == n,
|
||
"expected return type of length {}, found `{}` with length {}",
|
||
n,
|
||
ret_ty,
|
||
out_len
|
||
);
|
||
require!(
|
||
in_elem == out_ty,
|
||
"expected return element type `{}` (element of input `{}`), \
|
||
found `{}` with element type `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
ret_ty,
|
||
out_ty
|
||
);
|
||
|
||
let total_len = u128::from(in_len) * 2;
|
||
|
||
let vector = args[2].immediate();
|
||
|
||
let indices: Option<Vec<_>> = (0..n)
|
||
.map(|i| {
|
||
let arg_idx = i;
|
||
let val = bx.const_get_elt(vector, i as u64);
|
||
match bx.const_to_opt_u128(val, true) {
|
||
None => {
|
||
emit_error!("shuffle index #{} is not a constant", arg_idx);
|
||
None
|
||
}
|
||
Some(idx) if idx >= total_len => {
|
||
emit_error!(
|
||
"shuffle index #{} is out of bounds (limit {})",
|
||
arg_idx,
|
||
total_len
|
||
);
|
||
None
|
||
}
|
||
Some(idx) => Some(bx.const_i32(idx as i32)),
|
||
}
|
||
})
|
||
.collect();
|
||
let indices = match indices {
|
||
Some(i) => i,
|
||
None => return Ok(bx.const_null(llret_ty)),
|
||
};
|
||
|
||
return Ok(bx.shuffle_vector(
|
||
args[0].immediate(),
|
||
args[1].immediate(),
|
||
bx.const_vector(&indices),
|
||
));
|
||
}
|
||
|
||
if name == sym::simd_insert {
|
||
require!(
|
||
in_elem == arg_tys[2],
|
||
"expected inserted type `{}` (element of input `{}`), found `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
arg_tys[2]
|
||
);
|
||
return Ok(bx.insert_element(
|
||
args[0].immediate(),
|
||
args[2].immediate(),
|
||
args[1].immediate(),
|
||
));
|
||
}
|
||
if name == sym::simd_extract {
|
||
require!(
|
||
ret_ty == in_elem,
|
||
"expected return type `{}` (element of input `{}`), found `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
ret_ty
|
||
);
|
||
return Ok(bx.extract_element(args[0].immediate(), args[1].immediate()));
|
||
}
|
||
|
||
if name == sym::simd_select {
|
||
let m_elem_ty = in_elem;
|
||
let m_len = in_len;
|
||
require_simd!(arg_tys[1], "argument");
|
||
let (v_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
require!(
|
||
m_len == v_len,
|
||
"mismatched lengths: mask length `{}` != other vector length `{}`",
|
||
m_len,
|
||
v_len
|
||
);
|
||
match m_elem_ty.kind() {
|
||
ty::Int(_) => {}
|
||
_ => return_error!("mask element type is `{}`, expected `i_`", m_elem_ty),
|
||
}
|
||
// truncate the mask to a vector of i1s
|
||
let i1 = bx.type_i1();
|
||
let i1xn = bx.type_vector(i1, m_len as u64);
|
||
let m_i1s = bx.trunc(args[0].immediate(), i1xn);
|
||
return Ok(bx.select(m_i1s, args[1].immediate(), args[2].immediate()));
|
||
}
|
||
|
||
if name == sym::simd_bitmask {
|
||
// The `fn simd_bitmask(vector) -> unsigned integer` intrinsic takes a
|
||
// vector mask and returns an unsigned integer containing the most
|
||
// significant bit (MSB) of each lane.
|
||
|
||
// If the vector has less than 8 lanes, an u8 is returned with zeroed
|
||
// trailing bits.
|
||
let expected_int_bits = in_len.max(8);
|
||
match ret_ty.kind() {
|
||
ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => (),
|
||
_ => return_error!("bitmask `{}`, expected `u{}`", ret_ty, expected_int_bits),
|
||
}
|
||
|
||
// Integer vector <i{in_bitwidth} x in_len>:
|
||
let (i_xn, in_elem_bitwidth) = match in_elem.kind() {
|
||
ty::Int(i) => (
|
||
args[0].immediate(),
|
||
i.bit_width().unwrap_or_else(|| bx.data_layout().pointer_size.bits()),
|
||
),
|
||
ty::Uint(i) => (
|
||
args[0].immediate(),
|
||
i.bit_width().unwrap_or_else(|| bx.data_layout().pointer_size.bits()),
|
||
),
|
||
_ => return_error!(
|
||
"vector argument `{}`'s element type `{}`, expected integer element type",
|
||
in_ty,
|
||
in_elem
|
||
),
|
||
};
|
||
|
||
// Shift the MSB to the right by "in_elem_bitwidth - 1" into the first bit position.
|
||
let shift_indices =
|
||
vec![
|
||
bx.cx.const_int(bx.type_ix(in_elem_bitwidth), (in_elem_bitwidth - 1) as _);
|
||
in_len as _
|
||
];
|
||
let i_xn_msb = bx.lshr(i_xn, bx.const_vector(shift_indices.as_slice()));
|
||
// Truncate vector to an <i1 x N>
|
||
let i1xn = bx.trunc(i_xn_msb, bx.type_vector(bx.type_i1(), in_len));
|
||
// Bitcast <i1 x N> to iN:
|
||
let i_ = bx.bitcast(i1xn, bx.type_ix(in_len));
|
||
// Zero-extend iN to the bitmask type:
|
||
return Ok(bx.zext(i_, bx.type_ix(expected_int_bits)));
|
||
}
|
||
|
||
fn simd_simple_float_intrinsic(
|
||
name: Symbol,
|
||
in_elem: &::rustc_middle::ty::TyS<'_>,
|
||
in_ty: &::rustc_middle::ty::TyS<'_>,
|
||
in_len: u64,
|
||
bx: &mut Builder<'a, 'll, 'tcx>,
|
||
span: Span,
|
||
args: &[OperandRef<'tcx, &'ll Value>],
|
||
) -> Result<&'ll Value, ()> {
|
||
macro_rules! emit_error {
|
||
($msg: tt) => {
|
||
emit_error!($msg, )
|
||
};
|
||
($msg: tt, $($fmt: tt)*) => {
|
||
span_invalid_monomorphization_error(
|
||
bx.sess(), span,
|
||
&format!(concat!("invalid monomorphization of `{}` intrinsic: ", $msg),
|
||
name, $($fmt)*));
|
||
}
|
||
}
|
||
macro_rules! return_error {
|
||
($($fmt: tt)*) => {
|
||
{
|
||
emit_error!($($fmt)*);
|
||
return Err(());
|
||
}
|
||
}
|
||
}
|
||
|
||
let (elem_ty_str, elem_ty) = if let ty::Float(f) = in_elem.kind() {
|
||
let elem_ty = bx.cx.type_float_from_ty(*f);
|
||
match f.bit_width() {
|
||
32 => ("f32", elem_ty),
|
||
64 => ("f64", elem_ty),
|
||
_ => {
|
||
return_error!(
|
||
"unsupported element type `{}` of floating-point vector `{}`",
|
||
f.name_str(),
|
||
in_ty
|
||
);
|
||
}
|
||
}
|
||
} else {
|
||
return_error!("`{}` is not a floating-point type", in_ty);
|
||
};
|
||
|
||
let vec_ty = bx.type_vector(elem_ty, in_len);
|
||
|
||
let (intr_name, fn_ty) = match name {
|
||
sym::simd_fsqrt => ("sqrt", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fsin => ("sin", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fcos => ("cos", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fabs => ("fabs", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_floor => ("floor", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_ceil => ("ceil", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fexp => ("exp", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fexp2 => ("exp2", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_flog10 => ("log10", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_flog2 => ("log2", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_flog => ("log", bx.type_func(&[vec_ty], vec_ty)),
|
||
sym::simd_fpowi => ("powi", bx.type_func(&[vec_ty, bx.type_i32()], vec_ty)),
|
||
sym::simd_fpow => ("pow", bx.type_func(&[vec_ty, vec_ty], vec_ty)),
|
||
sym::simd_fma => ("fma", bx.type_func(&[vec_ty, vec_ty, vec_ty], vec_ty)),
|
||
_ => return_error!("unrecognized intrinsic `{}`", name),
|
||
};
|
||
|
||
let llvm_name = &format!("llvm.{0}.v{1}{2}", intr_name, in_len, elem_ty_str);
|
||
let f = bx.declare_cfn(&llvm_name, llvm::UnnamedAddr::No, fn_ty);
|
||
let c = bx.call(f, &args.iter().map(|arg| arg.immediate()).collect::<Vec<_>>(), None);
|
||
unsafe { llvm::LLVMRustSetHasUnsafeAlgebra(c) };
|
||
Ok(c)
|
||
}
|
||
|
||
if std::matches!(
|
||
name,
|
||
sym::simd_fsqrt
|
||
| sym::simd_fsin
|
||
| sym::simd_fcos
|
||
| sym::simd_fabs
|
||
| sym::simd_floor
|
||
| sym::simd_ceil
|
||
| sym::simd_fexp
|
||
| sym::simd_fexp2
|
||
| sym::simd_flog10
|
||
| sym::simd_flog2
|
||
| sym::simd_flog
|
||
| sym::simd_fpowi
|
||
| sym::simd_fpow
|
||
| sym::simd_fma
|
||
) {
|
||
return simd_simple_float_intrinsic(name, in_elem, in_ty, in_len, bx, span, args);
|
||
}
|
||
|
||
// FIXME: use:
|
||
// https://github.com/llvm-mirror/llvm/blob/master/include/llvm/IR/Function.h#L182
|
||
// https://github.com/llvm-mirror/llvm/blob/master/include/llvm/IR/Intrinsics.h#L81
|
||
fn llvm_vector_str(elem_ty: Ty<'_>, vec_len: u64, no_pointers: usize) -> String {
|
||
let p0s: String = "p0".repeat(no_pointers);
|
||
match *elem_ty.kind() {
|
||
ty::Int(v) => format!("v{}{}i{}", vec_len, p0s, v.bit_width().unwrap()),
|
||
ty::Uint(v) => format!("v{}{}i{}", vec_len, p0s, v.bit_width().unwrap()),
|
||
ty::Float(v) => format!("v{}{}f{}", vec_len, p0s, v.bit_width()),
|
||
_ => unreachable!(),
|
||
}
|
||
}
|
||
|
||
fn llvm_vector_ty(
|
||
cx: &CodegenCx<'ll, '_>,
|
||
elem_ty: Ty<'_>,
|
||
vec_len: u64,
|
||
mut no_pointers: usize,
|
||
) -> &'ll Type {
|
||
// FIXME: use cx.layout_of(ty).llvm_type() ?
|
||
let mut elem_ty = match *elem_ty.kind() {
|
||
ty::Int(v) => cx.type_int_from_ty(v),
|
||
ty::Uint(v) => cx.type_uint_from_ty(v),
|
||
ty::Float(v) => cx.type_float_from_ty(v),
|
||
_ => unreachable!(),
|
||
};
|
||
while no_pointers > 0 {
|
||
elem_ty = cx.type_ptr_to(elem_ty);
|
||
no_pointers -= 1;
|
||
}
|
||
cx.type_vector(elem_ty, vec_len)
|
||
}
|
||
|
||
if name == sym::simd_gather {
|
||
// simd_gather(values: <N x T>, pointers: <N x *_ T>,
|
||
// mask: <N x i{M}>) -> <N x T>
|
||
// * N: number of elements in the input vectors
|
||
// * T: type of the element to load
|
||
// * M: any integer width is supported, will be truncated to i1
|
||
|
||
// All types must be simd vector types
|
||
require_simd!(in_ty, "first");
|
||
require_simd!(arg_tys[1], "second");
|
||
require_simd!(arg_tys[2], "third");
|
||
require_simd!(ret_ty, "return");
|
||
|
||
// Of the same length:
|
||
let (out_len, _) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
let (out_len2, _) = arg_tys[2].simd_size_and_type(bx.tcx());
|
||
require!(
|
||
in_len == out_len,
|
||
"expected {} argument with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
"second",
|
||
in_len,
|
||
in_ty,
|
||
arg_tys[1],
|
||
out_len
|
||
);
|
||
require!(
|
||
in_len == out_len2,
|
||
"expected {} argument with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
"third",
|
||
in_len,
|
||
in_ty,
|
||
arg_tys[2],
|
||
out_len2
|
||
);
|
||
|
||
// The return type must match the first argument type
|
||
require!(ret_ty == in_ty, "expected return type `{}`, found `{}`", in_ty, ret_ty);
|
||
|
||
// This counts how many pointers
|
||
fn ptr_count(t: Ty<'_>) -> usize {
|
||
match t.kind() {
|
||
ty::RawPtr(p) => 1 + ptr_count(p.ty),
|
||
_ => 0,
|
||
}
|
||
}
|
||
|
||
// Non-ptr type
|
||
fn non_ptr(t: Ty<'_>) -> Ty<'_> {
|
||
match t.kind() {
|
||
ty::RawPtr(p) => non_ptr(p.ty),
|
||
_ => t,
|
||
}
|
||
}
|
||
|
||
// The second argument must be a simd vector with an element type that's a pointer
|
||
// to the element type of the first argument
|
||
let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
|
||
let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
let (pointer_count, underlying_ty) = match element_ty1.kind() {
|
||
ty::RawPtr(p) if p.ty == in_elem => (ptr_count(element_ty1), non_ptr(element_ty1)),
|
||
_ => {
|
||
require!(
|
||
false,
|
||
"expected element type `{}` of second argument `{}` \
|
||
to be a pointer to the element type `{}` of the first \
|
||
argument `{}`, found `{}` != `*_ {}`",
|
||
element_ty1,
|
||
arg_tys[1],
|
||
in_elem,
|
||
in_ty,
|
||
element_ty1,
|
||
in_elem
|
||
);
|
||
unreachable!();
|
||
}
|
||
};
|
||
assert!(pointer_count > 0);
|
||
assert_eq!(pointer_count - 1, ptr_count(element_ty0));
|
||
assert_eq!(underlying_ty, non_ptr(element_ty0));
|
||
|
||
// The element type of the third argument must be a signed integer type of any width:
|
||
let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
|
||
match element_ty2.kind() {
|
||
ty::Int(_) => (),
|
||
_ => {
|
||
require!(
|
||
false,
|
||
"expected element type `{}` of third argument `{}` \
|
||
to be a signed integer type",
|
||
element_ty2,
|
||
arg_tys[2]
|
||
);
|
||
}
|
||
}
|
||
|
||
// Alignment of T, must be a constant integer value:
|
||
let alignment_ty = bx.type_i32();
|
||
let alignment = bx.const_i32(bx.align_of(in_elem).bytes() as i32);
|
||
|
||
// Truncate the mask vector to a vector of i1s:
|
||
let (mask, mask_ty) = {
|
||
let i1 = bx.type_i1();
|
||
let i1xn = bx.type_vector(i1, in_len);
|
||
(bx.trunc(args[2].immediate(), i1xn), i1xn)
|
||
};
|
||
|
||
// Type of the vector of pointers:
|
||
let llvm_pointer_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count);
|
||
let llvm_pointer_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count);
|
||
|
||
// Type of the vector of elements:
|
||
let llvm_elem_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count - 1);
|
||
let llvm_elem_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count - 1);
|
||
|
||
let llvm_intrinsic =
|
||
format!("llvm.masked.gather.{}.{}", llvm_elem_vec_str, llvm_pointer_vec_str);
|
||
let f = bx.declare_cfn(
|
||
&llvm_intrinsic,
|
||
llvm::UnnamedAddr::No,
|
||
bx.type_func(
|
||
&[llvm_pointer_vec_ty, alignment_ty, mask_ty, llvm_elem_vec_ty],
|
||
llvm_elem_vec_ty,
|
||
),
|
||
);
|
||
let v = bx.call(f, &[args[1].immediate(), alignment, mask, args[0].immediate()], None);
|
||
return Ok(v);
|
||
}
|
||
|
||
if name == sym::simd_scatter {
|
||
// simd_scatter(values: <N x T>, pointers: <N x *mut T>,
|
||
// mask: <N x i{M}>) -> ()
|
||
// * N: number of elements in the input vectors
|
||
// * T: type of the element to load
|
||
// * M: any integer width is supported, will be truncated to i1
|
||
|
||
// All types must be simd vector types
|
||
require_simd!(in_ty, "first");
|
||
require_simd!(arg_tys[1], "second");
|
||
require_simd!(arg_tys[2], "third");
|
||
|
||
// Of the same length:
|
||
let (element_len1, _) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
let (element_len2, _) = arg_tys[2].simd_size_and_type(bx.tcx());
|
||
require!(
|
||
in_len == element_len1,
|
||
"expected {} argument with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
"second",
|
||
in_len,
|
||
in_ty,
|
||
arg_tys[1],
|
||
element_len1
|
||
);
|
||
require!(
|
||
in_len == element_len2,
|
||
"expected {} argument with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
"third",
|
||
in_len,
|
||
in_ty,
|
||
arg_tys[2],
|
||
element_len2
|
||
);
|
||
|
||
// This counts how many pointers
|
||
fn ptr_count(t: Ty<'_>) -> usize {
|
||
match t.kind() {
|
||
ty::RawPtr(p) => 1 + ptr_count(p.ty),
|
||
_ => 0,
|
||
}
|
||
}
|
||
|
||
// Non-ptr type
|
||
fn non_ptr(t: Ty<'_>) -> Ty<'_> {
|
||
match t.kind() {
|
||
ty::RawPtr(p) => non_ptr(p.ty),
|
||
_ => t,
|
||
}
|
||
}
|
||
|
||
// The second argument must be a simd vector with an element type that's a pointer
|
||
// to the element type of the first argument
|
||
let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
|
||
let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
|
||
let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
|
||
let (pointer_count, underlying_ty) = match element_ty1.kind() {
|
||
ty::RawPtr(p) if p.ty == in_elem && p.mutbl == hir::Mutability::Mut => {
|
||
(ptr_count(element_ty1), non_ptr(element_ty1))
|
||
}
|
||
_ => {
|
||
require!(
|
||
false,
|
||
"expected element type `{}` of second argument `{}` \
|
||
to be a pointer to the element type `{}` of the first \
|
||
argument `{}`, found `{}` != `*mut {}`",
|
||
element_ty1,
|
||
arg_tys[1],
|
||
in_elem,
|
||
in_ty,
|
||
element_ty1,
|
||
in_elem
|
||
);
|
||
unreachable!();
|
||
}
|
||
};
|
||
assert!(pointer_count > 0);
|
||
assert_eq!(pointer_count - 1, ptr_count(element_ty0));
|
||
assert_eq!(underlying_ty, non_ptr(element_ty0));
|
||
|
||
// The element type of the third argument must be a signed integer type of any width:
|
||
match element_ty2.kind() {
|
||
ty::Int(_) => (),
|
||
_ => {
|
||
require!(
|
||
false,
|
||
"expected element type `{}` of third argument `{}` \
|
||
be a signed integer type",
|
||
element_ty2,
|
||
arg_tys[2]
|
||
);
|
||
}
|
||
}
|
||
|
||
// Alignment of T, must be a constant integer value:
|
||
let alignment_ty = bx.type_i32();
|
||
let alignment = bx.const_i32(bx.align_of(in_elem).bytes() as i32);
|
||
|
||
// Truncate the mask vector to a vector of i1s:
|
||
let (mask, mask_ty) = {
|
||
let i1 = bx.type_i1();
|
||
let i1xn = bx.type_vector(i1, in_len);
|
||
(bx.trunc(args[2].immediate(), i1xn), i1xn)
|
||
};
|
||
|
||
let ret_t = bx.type_void();
|
||
|
||
// Type of the vector of pointers:
|
||
let llvm_pointer_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count);
|
||
let llvm_pointer_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count);
|
||
|
||
// Type of the vector of elements:
|
||
let llvm_elem_vec_ty = llvm_vector_ty(bx, underlying_ty, in_len, pointer_count - 1);
|
||
let llvm_elem_vec_str = llvm_vector_str(underlying_ty, in_len, pointer_count - 1);
|
||
|
||
let llvm_intrinsic =
|
||
format!("llvm.masked.scatter.{}.{}", llvm_elem_vec_str, llvm_pointer_vec_str);
|
||
let f = bx.declare_cfn(
|
||
&llvm_intrinsic,
|
||
llvm::UnnamedAddr::No,
|
||
bx.type_func(&[llvm_elem_vec_ty, llvm_pointer_vec_ty, alignment_ty, mask_ty], ret_t),
|
||
);
|
||
let v = bx.call(f, &[args[0].immediate(), args[1].immediate(), alignment, mask], None);
|
||
return Ok(v);
|
||
}
|
||
|
||
macro_rules! arith_red {
|
||
($name:ident : $integer_reduce:ident, $float_reduce:ident, $ordered:expr, $op:ident,
|
||
$identity:expr) => {
|
||
if name == sym::$name {
|
||
require!(
|
||
ret_ty == in_elem,
|
||
"expected return type `{}` (element of input `{}`), found `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
ret_ty
|
||
);
|
||
return match in_elem.kind() {
|
||
ty::Int(_) | ty::Uint(_) => {
|
||
let r = bx.$integer_reduce(args[0].immediate());
|
||
if $ordered {
|
||
// if overflow occurs, the result is the
|
||
// mathematical result modulo 2^n:
|
||
Ok(bx.$op(args[1].immediate(), r))
|
||
} else {
|
||
Ok(bx.$integer_reduce(args[0].immediate()))
|
||
}
|
||
}
|
||
ty::Float(f) => {
|
||
let acc = if $ordered {
|
||
// ordered arithmetic reductions take an accumulator
|
||
args[1].immediate()
|
||
} else {
|
||
// unordered arithmetic reductions use the identity accumulator
|
||
match f.bit_width() {
|
||
32 => bx.const_real(bx.type_f32(), $identity),
|
||
64 => bx.const_real(bx.type_f64(), $identity),
|
||
v => return_error!(
|
||
r#"
|
||
unsupported {} from `{}` with element `{}` of size `{}` to `{}`"#,
|
||
sym::$name,
|
||
in_ty,
|
||
in_elem,
|
||
v,
|
||
ret_ty
|
||
),
|
||
}
|
||
};
|
||
Ok(bx.$float_reduce(acc, args[0].immediate()))
|
||
}
|
||
_ => return_error!(
|
||
"unsupported {} from `{}` with element `{}` to `{}`",
|
||
sym::$name,
|
||
in_ty,
|
||
in_elem,
|
||
ret_ty
|
||
),
|
||
};
|
||
}
|
||
};
|
||
}
|
||
|
||
arith_red!(simd_reduce_add_ordered: vector_reduce_add, vector_reduce_fadd, true, add, 0.0);
|
||
arith_red!(simd_reduce_mul_ordered: vector_reduce_mul, vector_reduce_fmul, true, mul, 1.0);
|
||
arith_red!(
|
||
simd_reduce_add_unordered: vector_reduce_add,
|
||
vector_reduce_fadd_fast,
|
||
false,
|
||
add,
|
||
0.0
|
||
);
|
||
arith_red!(
|
||
simd_reduce_mul_unordered: vector_reduce_mul,
|
||
vector_reduce_fmul_fast,
|
||
false,
|
||
mul,
|
||
1.0
|
||
);
|
||
|
||
macro_rules! minmax_red {
|
||
($name:ident: $int_red:ident, $float_red:ident) => {
|
||
if name == sym::$name {
|
||
require!(
|
||
ret_ty == in_elem,
|
||
"expected return type `{}` (element of input `{}`), found `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
ret_ty
|
||
);
|
||
return match in_elem.kind() {
|
||
ty::Int(_i) => Ok(bx.$int_red(args[0].immediate(), true)),
|
||
ty::Uint(_u) => Ok(bx.$int_red(args[0].immediate(), false)),
|
||
ty::Float(_f) => Ok(bx.$float_red(args[0].immediate())),
|
||
_ => return_error!(
|
||
"unsupported {} from `{}` with element `{}` to `{}`",
|
||
sym::$name,
|
||
in_ty,
|
||
in_elem,
|
||
ret_ty
|
||
),
|
||
};
|
||
}
|
||
};
|
||
}
|
||
|
||
minmax_red!(simd_reduce_min: vector_reduce_min, vector_reduce_fmin);
|
||
minmax_red!(simd_reduce_max: vector_reduce_max, vector_reduce_fmax);
|
||
|
||
minmax_red!(simd_reduce_min_nanless: vector_reduce_min, vector_reduce_fmin_fast);
|
||
minmax_red!(simd_reduce_max_nanless: vector_reduce_max, vector_reduce_fmax_fast);
|
||
|
||
macro_rules! bitwise_red {
|
||
($name:ident : $red:ident, $boolean:expr) => {
|
||
if name == sym::$name {
|
||
let input = if !$boolean {
|
||
require!(
|
||
ret_ty == in_elem,
|
||
"expected return type `{}` (element of input `{}`), found `{}`",
|
||
in_elem,
|
||
in_ty,
|
||
ret_ty
|
||
);
|
||
args[0].immediate()
|
||
} else {
|
||
match in_elem.kind() {
|
||
ty::Int(_) | ty::Uint(_) => {}
|
||
_ => return_error!(
|
||
"unsupported {} from `{}` with element `{}` to `{}`",
|
||
sym::$name,
|
||
in_ty,
|
||
in_elem,
|
||
ret_ty
|
||
),
|
||
}
|
||
|
||
// boolean reductions operate on vectors of i1s:
|
||
let i1 = bx.type_i1();
|
||
let i1xn = bx.type_vector(i1, in_len as u64);
|
||
bx.trunc(args[0].immediate(), i1xn)
|
||
};
|
||
return match in_elem.kind() {
|
||
ty::Int(_) | ty::Uint(_) => {
|
||
let r = bx.$red(input);
|
||
Ok(if !$boolean { r } else { bx.zext(r, bx.type_bool()) })
|
||
}
|
||
_ => return_error!(
|
||
"unsupported {} from `{}` with element `{}` to `{}`",
|
||
sym::$name,
|
||
in_ty,
|
||
in_elem,
|
||
ret_ty
|
||
),
|
||
};
|
||
}
|
||
};
|
||
}
|
||
|
||
bitwise_red!(simd_reduce_and: vector_reduce_and, false);
|
||
bitwise_red!(simd_reduce_or: vector_reduce_or, false);
|
||
bitwise_red!(simd_reduce_xor: vector_reduce_xor, false);
|
||
bitwise_red!(simd_reduce_all: vector_reduce_and, true);
|
||
bitwise_red!(simd_reduce_any: vector_reduce_or, true);
|
||
|
||
if name == sym::simd_cast {
|
||
require_simd!(ret_ty, "return");
|
||
let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
|
||
require!(
|
||
in_len == out_len,
|
||
"expected return type with length {} (same as input type `{}`), \
|
||
found `{}` with length {}",
|
||
in_len,
|
||
in_ty,
|
||
ret_ty,
|
||
out_len
|
||
);
|
||
// casting cares about nominal type, not just structural type
|
||
if in_elem == out_elem {
|
||
return Ok(args[0].immediate());
|
||
}
|
||
|
||
enum Style {
|
||
Float,
|
||
Int(/* is signed? */ bool),
|
||
Unsupported,
|
||
}
|
||
|
||
let (in_style, in_width) = match in_elem.kind() {
|
||
// vectors of pointer-sized integers should've been
|
||
// disallowed before here, so this unwrap is safe.
|
||
ty::Int(i) => (Style::Int(true), i.bit_width().unwrap()),
|
||
ty::Uint(u) => (Style::Int(false), u.bit_width().unwrap()),
|
||
ty::Float(f) => (Style::Float, f.bit_width()),
|
||
_ => (Style::Unsupported, 0),
|
||
};
|
||
let (out_style, out_width) = match out_elem.kind() {
|
||
ty::Int(i) => (Style::Int(true), i.bit_width().unwrap()),
|
||
ty::Uint(u) => (Style::Int(false), u.bit_width().unwrap()),
|
||
ty::Float(f) => (Style::Float, f.bit_width()),
|
||
_ => (Style::Unsupported, 0),
|
||
};
|
||
|
||
match (in_style, out_style) {
|
||
(Style::Int(in_is_signed), Style::Int(_)) => {
|
||
return Ok(match in_width.cmp(&out_width) {
|
||
Ordering::Greater => bx.trunc(args[0].immediate(), llret_ty),
|
||
Ordering::Equal => args[0].immediate(),
|
||
Ordering::Less => {
|
||
if in_is_signed {
|
||
bx.sext(args[0].immediate(), llret_ty)
|
||
} else {
|
||
bx.zext(args[0].immediate(), llret_ty)
|
||
}
|
||
}
|
||
});
|
||
}
|
||
(Style::Int(in_is_signed), Style::Float) => {
|
||
return Ok(if in_is_signed {
|
||
bx.sitofp(args[0].immediate(), llret_ty)
|
||
} else {
|
||
bx.uitofp(args[0].immediate(), llret_ty)
|
||
});
|
||
}
|
||
(Style::Float, Style::Int(out_is_signed)) => {
|
||
return Ok(if out_is_signed {
|
||
bx.fptosi(args[0].immediate(), llret_ty)
|
||
} else {
|
||
bx.fptoui(args[0].immediate(), llret_ty)
|
||
});
|
||
}
|
||
(Style::Float, Style::Float) => {
|
||
return Ok(match in_width.cmp(&out_width) {
|
||
Ordering::Greater => bx.fptrunc(args[0].immediate(), llret_ty),
|
||
Ordering::Equal => args[0].immediate(),
|
||
Ordering::Less => bx.fpext(args[0].immediate(), llret_ty),
|
||
});
|
||
}
|
||
_ => { /* Unsupported. Fallthrough. */ }
|
||
}
|
||
require!(
|
||
false,
|
||
"unsupported cast from `{}` with element `{}` to `{}` with element `{}`",
|
||
in_ty,
|
||
in_elem,
|
||
ret_ty,
|
||
out_elem
|
||
);
|
||
}
|
||
macro_rules! arith_bin {
|
||
($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
|
||
$(if name == sym::$name {
|
||
match in_elem.kind() {
|
||
$($(ty::$p(_))|* => {
|
||
return Ok(bx.$call(args[0].immediate(), args[1].immediate()))
|
||
})*
|
||
_ => {},
|
||
}
|
||
require!(false,
|
||
"unsupported operation on `{}` with element `{}`",
|
||
in_ty,
|
||
in_elem)
|
||
})*
|
||
}
|
||
}
|
||
arith_bin! {
|
||
simd_add: Uint, Int => add, Float => fadd;
|
||
simd_sub: Uint, Int => sub, Float => fsub;
|
||
simd_mul: Uint, Int => mul, Float => fmul;
|
||
simd_div: Uint => udiv, Int => sdiv, Float => fdiv;
|
||
simd_rem: Uint => urem, Int => srem, Float => frem;
|
||
simd_shl: Uint, Int => shl;
|
||
simd_shr: Uint => lshr, Int => ashr;
|
||
simd_and: Uint, Int => and;
|
||
simd_or: Uint, Int => or;
|
||
simd_xor: Uint, Int => xor;
|
||
simd_fmax: Float => maxnum;
|
||
simd_fmin: Float => minnum;
|
||
|
||
}
|
||
macro_rules! arith_un {
|
||
($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
|
||
$(if name == sym::$name {
|
||
match in_elem.kind() {
|
||
$($(ty::$p(_))|* => {
|
||
return Ok(bx.$call(args[0].immediate()))
|
||
})*
|
||
_ => {},
|
||
}
|
||
require!(false,
|
||
"unsupported operation on `{}` with element `{}`",
|
||
in_ty,
|
||
in_elem)
|
||
})*
|
||
}
|
||
}
|
||
arith_un! {
|
||
simd_neg: Int => neg, Float => fneg;
|
||
}
|
||
|
||
if name == sym::simd_saturating_add || name == sym::simd_saturating_sub {
|
||
let lhs = args[0].immediate();
|
||
let rhs = args[1].immediate();
|
||
let is_add = name == sym::simd_saturating_add;
|
||
let ptr_bits = bx.tcx().data_layout.pointer_size.bits() as _;
|
||
let (signed, elem_width, elem_ty) = match *in_elem.kind() {
|
||
ty::Int(i) => (true, i.bit_width().unwrap_or(ptr_bits), bx.cx.type_int_from_ty(i)),
|
||
ty::Uint(i) => (false, i.bit_width().unwrap_or(ptr_bits), bx.cx.type_uint_from_ty(i)),
|
||
_ => {
|
||
return_error!(
|
||
"expected element type `{}` of vector type `{}` \
|
||
to be a signed or unsigned integer type",
|
||
arg_tys[0].simd_size_and_type(bx.tcx()).1,
|
||
arg_tys[0]
|
||
);
|
||
}
|
||
};
|
||
let llvm_intrinsic = &format!(
|
||
"llvm.{}{}.sat.v{}i{}",
|
||
if signed { 's' } else { 'u' },
|
||
if is_add { "add" } else { "sub" },
|
||
in_len,
|
||
elem_width
|
||
);
|
||
let vec_ty = bx.cx.type_vector(elem_ty, in_len as u64);
|
||
|
||
let f = bx.declare_cfn(
|
||
&llvm_intrinsic,
|
||
llvm::UnnamedAddr::No,
|
||
bx.type_func(&[vec_ty, vec_ty], vec_ty),
|
||
);
|
||
let v = bx.call(f, &[lhs, rhs], None);
|
||
return Ok(v);
|
||
}
|
||
|
||
span_bug!(span, "unknown SIMD intrinsic");
|
||
}
|
||
|
||
// Returns the width of an int Ty, and if it's signed or not
|
||
// Returns None if the type is not an integer
|
||
// FIXME: there’s multiple of this functions, investigate using some of the already existing
|
||
// stuffs.
|
||
fn int_type_width_signed(ty: Ty<'_>, cx: &CodegenCx<'_, '_>) -> Option<(u64, bool)> {
|
||
match ty.kind() {
|
||
ty::Int(t) => {
|
||
Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.pointer_width)), true))
|
||
}
|
||
ty::Uint(t) => {
|
||
Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.pointer_width)), false))
|
||
}
|
||
_ => None,
|
||
}
|
||
}
|