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Apply workaround to ppc64

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This commit is contained in:
Caleb Zulawski 2023-07-22 18:33:33 -04:00
parent d07ce3cef9
commit ad747af0bb
1 changed files with 16 additions and 3 deletions
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19
crates/test_helpers/src/subnormals.rs
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@ -44,13 +44,20 @@ impl_else! { i8, i16, i32, i64, isize, u8, u16, u32, u64, usize }
/// AltiVec should flush subnormal inputs to zero, but QEMU seems to only flush outputs.
/// https://gitlab.com/qemu-project/qemu/-/issues/1779
#[cfg(all(target_arch = "powerpc", target_feature = "altivec"))]
#[cfg(all(
any(target_arch = "powerpc", target_arch = "powerpc64"),
target_feature = "altivec"
))]
fn in_buggy_qemu() -> bool {
use std::sync::OnceLock;
static BUGGY: OnceLock<bool> = OnceLock::new();
fn add(x: f32, y: f32) -> f32 {
#[cfg(target_arch = "powerpc")]
use core::arch::powerpc::*;
#[cfg(target_arch = "powerpc64")]
use core::arch::powerpc64::*;
let array: [f32; 4] =
unsafe { core::mem::transmute(vec_add(vec_splats(x), vec_splats(y))) };
array[0]
@ -59,7 +66,10 @@ fn in_buggy_qemu() -> bool {
*BUGGY.get_or_init(|| add(-1.0857398e-38, 0.).is_sign_negative())
}
#[cfg(all(target_arch = "powerpc", target_feature = "altivec"))]
#[cfg(all(
any(target_arch = "powerpc", target_arch = "powerpc64"),
target_feature = "altivec"
))]
pub fn flush_in<T: FlushSubnormals>(x: T) -> T {
if in_buggy_qemu() {
x
@ -68,7 +78,10 @@ pub fn flush_in<T: FlushSubnormals>(x: T) -> T {
}
}
#[cfg(not(all(target_arch = "powerpc", target_feature = "altivec")))]
#[cfg(not(all(
any(target_arch = "powerpc", target_arch = "powerpc64"),
target_feature = "altivec"
)))]
pub fn flush_in<T: FlushSubnormals>(x: T) -> T {
x.flush()
}