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f32_bitwise && f64_bitwise

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This commit is contained in:
Svyatoslav Nikolsky
2017-06-06 10:45:05 +03:00
parent e9a7d39704
commit de85e5996a
3 changed files with 35 additions and 7 deletions
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24
src/interpreter/value.rs
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@ -599,7 +599,7 @@ impl_integer!(i64);
impl_integer!(u64);
macro_rules! impl_float {
($type: ident) => {
($type: ident, $int_type: ident) => {
impl Float<$type> for $type {
fn abs(self) -> $type { self.abs() }
fn floor(self) -> $type { self.floor() }
@ -641,16 +641,28 @@ macro_rules! impl_float {
self.max(other)
}
fn copysign(self, other: $type) -> $type {
// TODO: this may be buggy for edge cases
if self.is_sign_positive() == other.is_sign_positive() {
use std::mem::size_of;
if self.is_nan() {
return self;
}
let sign_mask: $int_type = 1 << ((size_of::<$int_type>() << 3) - 1);
let self_int: $int_type = self.transmute_into();
let other_int: $int_type = other.transmute_into();
let is_self_sign_set = (self_int & sign_mask) != 0;
let is_other_sign_set = (other_int & sign_mask) != 0;
if is_self_sign_set == is_other_sign_set {
self
} else if is_other_sign_set {
(self_int | sign_mask).transmute_into()
} else {
self * -1.0
(self_int & !sign_mask).transmute_into()
}
}
}
}
}
impl_float!(f32);
impl_float!(f64);
impl_float!(f32, i32);
impl_float!(f64, i64);