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Add an apfloat fallback for float to integer tests

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This commit is contained in:
Trevor Gross 2024-05-20 20:00:02 -04:00
parent a3b1dfb8d5
commit aaaf62bd6b
1 changed files with 30 additions and 5 deletions
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35
library/compiler-builtins/testcrate/tests/conv.rs
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@ -100,14 +100,39 @@ mod f_to_i {
use super::*;
macro_rules! f_to_i {
($x:ident, $($f:ty, $fn:ident);*;) => {
($x:ident, $f_ty:ty, $apfloat_ty:ident, $sys_available:meta, $($i_ty:ty, $fn:ident);*;) => {
$(
// it is undefined behavior in the first place to do conversions with NaNs
if !$x.is_nan() {
let conv0 = $x as $f;
let conv1: $f = $fn($x);
if !apfloat_fallback!(
$f_ty, $apfloat_ty, $sys_available, |x: FloatTy| x.is_nan() => no_convert, $x
) {
let conv0 = apfloat_fallback!(
$f_ty, $apfloat_ty, $sys_available,
// Use an `as` cast when the builtin is available on the system.
|x| x as $i_ty;
// When the builtin is not available, we need to use a different conversion
// method (since apfloat doesn't support `as` casting).
|x: $f_ty| {
use compiler_builtins::int::MinInt;
let apf = FloatTy::from_bits(x.to_bits().into());
let bits: usize = <$i_ty>::BITS.try_into().unwrap();
let err_fn = || panic!(
"Unable to convert value {x:?} to type {}:", stringify!($i_ty)
);
if <$i_ty>::SIGNED {
<$i_ty>::try_from(apf.to_i128(bits).value).ok().unwrap_or_else(err_fn)
} else {
<$i_ty>::try_from(apf.to_u128(bits).value).ok().unwrap_or_else(err_fn)
}
},
$x
);
let conv1: $i_ty = $fn($x);
if conv0 != conv1 {
panic!("{}({}): std: {}, builtins: {}", stringify!($fn), $x, conv0, conv1);
panic!("{}({:?}): std: {:?}, builtins: {:?}", stringify!($fn), $x, conv0, conv1);
}
}
)*