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Merged
alexcrichton merged 2 commits into from
Feb 22, 2022
Merged

Enable SSE 4.2 unconditionally #3833

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Enable SSE 4.2 unconditionally
alexcrichton Feb 22, 2022
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alexcrichton Feb 22, 2022
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2 changes: 1 addition & 1 deletion cranelift/codegen/meta/src/isa/x86.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ fn define_settings(shared: &SettingGroup) -> SettingGroup {
"has_sse42",
"Has support for SSE4.2.",
"SSE4.2: CPUID.01H:ECX.SSE4_2[bit 20]",
false,
true,
);
let has_avx = settings.add_bool(
"has_avx",
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11 changes: 8 additions & 3 deletions cranelift/codegen/src/isa/x64/mod.rs
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Expand Up @@ -178,11 +178,15 @@ fn isa_constructor(
let isa_flags = x64_settings::Flags::new(&shared_flags, builder);

// Check for compatibility between flags and ISA level
// requested. In particular, SIMD support requires SSE4.1.
// requested. In particular, SIMD support requires SSE4.2.
if shared_flags.enable_simd() {
if !isa_flags.has_sse3() || !isa_flags.has_ssse3() || !isa_flags.has_sse41() {
if !isa_flags.has_sse3()
|| !isa_flags.has_ssse3()
|| !isa_flags.has_sse41()
|| !isa_flags.has_sse42()
{
return Err(CodegenError::Unsupported(
"SIMD support requires SSE3, SSSE3, and SSE4.1 on x86_64.".into(),
"SIMD support requires SSE3, SSSE3, SSE4.1, and SSE4.2 on x86_64.".into(),
));
}
}
Expand Down Expand Up @@ -354,6 +358,7 @@ mod test {
isa_builder.set("has_sse3", "false").unwrap();
isa_builder.set("has_ssse3", "false").unwrap();
isa_builder.set("has_sse41", "false").unwrap();
isa_builder.set("has_sse42", "false").unwrap();
assert!(matches!(
isa_builder.finish(shared_flags),
Err(CodegenError::Unsupported(_)),
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2 changes: 1 addition & 1 deletion crates/fuzzing/src/generators.rs
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Expand Up @@ -749,8 +749,8 @@ impl<'a> Arbitrary<'a> for CodegenSettings {
std:"sse3" => clif:"has_sse3" ratio: 1 in 1,
std:"ssse3" => clif:"has_ssse3" ratio: 1 in 1,
std:"sse4.1" => clif:"has_sse41" ratio: 1 in 1,
std:"sse4.2" => clif:"has_sse42" ratio: 1 in 1,

std:"sse4.2" => clif:"has_sse42",
std:"popcnt" => clif:"has_popcnt",
std:"avx" => clif:"has_avx",
std:"avx2" => clif:"has_avx2",
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4 changes: 4 additions & 0 deletions crates/wasmtime/src/config.rs
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Expand Up @@ -552,6 +552,10 @@ impl Config {
/// this does not enable the [relaxed simd proposal] as that is not
/// implemented in Wasmtime at this time.
///
/// On x86_64 platforms note that enabling this feature requires SSE 4.2 and
/// below to be available on the target platform. Compilation will fail if
/// the compile target does not include SSE 4.2.
///
/// This is `true` by default.
///
/// [proposal]: https://github.com/webassembly/simd
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