Add an i128_lowering flag in TargetOptions

Not actually enabled by default anywhere yet.
This commit is contained in:
Scott McMurray 2017-12-03 21:53:48 -08:00
parent fdfbcf85d5
commit 1bc402fd80
5 changed files with 13 additions and 5 deletions

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@ -1176,9 +1176,10 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
saturating_float_casts: bool = (false, parse_bool, [TRACKED],
"make float->int casts UB-free: numbers outside the integer type's range are clipped to \
the max/min integer respectively, and NaN is mapped to 0"),
lower_128bit_ops: bool = (false, parse_bool, [TRACKED],
lower_128bit_ops: Option<bool> = (None, parse_opt_bool, [TRACKED],
"rewrite operators on i128 and u128 into lang item calls (typically provided \
by compiler-builtins) so translation doesn't need to support them"),
by compiler-builtins) so translation doesn't need to support them,
overriding the default for the current target"),
}
pub fn default_lib_output() -> CrateType {

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@ -453,6 +453,10 @@ pub struct TargetOptions {
/// Whether library functions call lowering/optimization is disabled in LLVM
/// for this target unconditionally.
pub no_builtins: bool,
/// Whether to lower 128-bit operations to compiler_builtins calls. Use if
/// your backend only supports 64-bit and smaller math.
pub i128_lowering: bool,
}
impl Default for TargetOptions {
@ -521,6 +525,7 @@ impl Default for TargetOptions {
requires_lto: false,
singlethread: false,
no_builtins: false,
i128_lowering: false,
}
}
}

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@ -25,7 +25,9 @@ impl MirPass for Lower128Bit {
tcx: TyCtxt<'a, 'tcx, 'tcx>,
_src: MirSource,
mir: &mut Mir<'tcx>) {
if !tcx.sess.opts.debugging_opts.lower_128bit_ops {
let debugging_override = tcx.sess.opts.debugging_opts.lower_128bit_ops;
let target_default = tcx.sess.host.options.i128_lowering;
if !debugging_override.unwrap_or(target_default) {
return
}

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@ -13,7 +13,7 @@
// ignore-asmjs
// ignore-emscripten
// compile-flags: -Z lower_128bit_ops -C debug_assertions=yes
// compile-flags: -Z lower_128bit_ops=yes -C debug_assertions=yes
#![feature(i128_type)]

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@ -13,7 +13,7 @@
// ignore-asmjs
// ignore-emscripten
// compile-flags: -Z lower_128bit_ops -C debug_assertions=no
// compile-flags: -Z lower_128bit_ops=yes -C debug_assertions=no
#![feature(i128_type)]