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intrinsics : uabs and iabs

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This commit is contained in:
est31 2016-11-25 02:33:35 +01:00
parent dc14a108ae
commit 2715367f08
1 changed files with 26 additions and 13 deletions
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39
src/libcompiler_builtins/lib.rs
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@ -292,12 +292,12 @@ pub mod reimpls {
#[export_name="__modti3"]
pub extern fn i128_mod(a: i128_, b: i128_) -> i128_ {
let b = b.abs();
let b = b.uabs();
let sa = a.signum();
let a = a.abs();
let a = a.uabs();
unsafe {
let mut r = ::core::mem::zeroed();
u128_div_mod(a as u128_, b as u128_, &mut r);
u128_div_mod(a, b, &mut r);
if sa == -1 { -(r as i128_) } else { r as i128_ }
}
}
@ -306,13 +306,13 @@ pub mod reimpls {
pub extern fn i128_div(a: i128_, b: i128_) -> i128_ {
let sa = a.signum();
let sb = b.signum();
let a = a.abs();
let b = b.abs();
let a = a.uabs();
let b = b.uabs();
let sr = sa * sb; // sign of quotient
if sr == -1 {
-(u128_div_mod(a as u128_, b as u128_, ptr::null_mut()) as i128_)
-(u128_div_mod(a, b, ptr::null_mut()) as i128_)
} else {
u128_div_mod(a as u128_, b as u128_, ptr::null_mut()) as i128_
u128_div_mod(a, b, ptr::null_mut()) as i128_
}
}
@ -340,9 +340,9 @@ pub mod reimpls {
}
let sa = a.signum();
let abs_a = a.abs();
let abs_a = a.iabs();
let sb = b.signum();
let abs_b = b.abs();
let abs_b = b.iabs();
if abs_a < 2 || abs_b < 2 {
return result;
}
@ -473,6 +473,19 @@ pub mod reimpls {
mul!(a, b, i128_, i64)
}
trait AbsExt: Sized {
fn uabs(self) -> u128_ {
self.iabs() as u128_
}
fn iabs(self) -> i128_;
}
impl AbsExt for i128_ {
fn iabs(self) -> i128_ {
((self ^ self).wrapping_sub(self))
}
}
trait FloatStuff: Sized {
type ToBytes;
@ -579,9 +592,9 @@ pub mod reimpls {
#[export_name="__floattidf"]
pub extern fn i128_as_f64(a: i128_) -> f64 {
match a.signum() {
1 => u128_as_f64(a.abs() as u128_),
1 => u128_as_f64(a.uabs()),
0 => 0.0,
-1 => -u128_as_f64(a.abs() as u128_),
-1 => -u128_as_f64(a.uabs()),
_ => unimplemented()
}
}
@ -589,9 +602,9 @@ pub mod reimpls {
#[export_name="__floattisf"]
pub extern fn i128_as_f32(a: i128_) -> f32 {
match a.signum() {
1 => u128_as_f32(a.abs() as u128_),
1 => u128_as_f32(a.uabs()),
0 => 0.0,
-1 => -u128_as_f32(a.abs() as u128_),
-1 => -u128_as_f32(a.uabs()),
_ => unimplemented()
}
}