Enable SSE 4.2 unconditionally (#3833)

* Enable SSE 4.2 unconditionally Fuzzing over the weekend found that `i64x2` comparison operators require `pcmpgtq` which is an SSE 4.2 instruction. Along the lines of #3816 this commit unconditionally enables and requires SSE 4.2 for compilation and fuzzing. It will no longer be possible to create a compiler for x86_64 with simd enabled if SSE 4.2 is disabled. * Update comment
2022-02-22 13:23:51 -06:00
parent 43d31c5bf7
commit 709f7e0c8a
4 changed files with 14 additions and 5 deletions
--- a/cranelift/codegen/meta/src/isa/x86.rs
+++ b/cranelift/codegen/meta/src/isa/x86.rs
@@ -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",