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x64: Lower SIMD requirement to SSE4.1 from SSE4.2 (#6206)

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Cranelift only has one instruction SIMD which depends on SSE4.2 so this
commit adds a lowering rule for `pcmpgtq` which doesn't use SSE4.2 and
enables lowering the baseline requirement for SIMD support from SSE4.2
to SSE4.1.

The `has_sse42` setting is no longer enabled by default for Cranelift.
Additionally `enable_simd` no longer requires `has_sse42` on x64.
Finally the fuzz-generator for Wasmtime codegen settings now enables
flipping the `has_sse42` setting instead of unconditionally setting it
to `true`.

The specific lowering for `pcmpgtq` is copied from LLVM's lowering of
this instruction.
This commit is contained in:
Alex Crichton
2023-04-14 12:24:43 -05:00
committed by GitHub
parent 26f9ce02bc
commit 2d25db047f
8 changed files with 62 additions and 15 deletions
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cranelift/native/src/lib.rs
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@@ -80,7 +80,6 @@ pub fn infer_native_flags(isa_builder: &mut dyn Configurable) -> Result<(), &'st
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();
if std::is_x86_feature_detected!("sse3") {
isa_builder.enable("has_sse3").unwrap();