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| author | Austin Clements <austin@google.com> | 2025-06-12 15:24:22 -0400 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2025-06-13 07:16:03 -0700 |
| commit | 9b9af3d6386d7564d71ff61468cea597bf0511bc (patch) | |
| tree | 3e1a479af66d059658a8294a3b23b8bef5c5d303 /src/internal/cpu/cpu.go | |
| parent | dfa6c7426316fb81c5f29b260b2de7822680ffd3 (diff) | |
| download | go-9b9af3d6386d7564d71ff61468cea597bf0511bc.tar.xz | |
[dev.simd] internal/cpu: add AVX-512-CD and DQ, and derived "basic AVX-512"
This adds detection for the CD and DQ sub-features of x86 AVX-512.
Building on these, we also add a "derived" AVX-512 feature that
bundles together the basic usable subset of subfeatures. Despite the F
in AVX-512-F standing for "foundation", AVX-512-F+BW+DQ+VL together
really form the basic usable subset of AVX-512 functionality. These
have also all been supported together by almost every CPU, and are
guaranteed by GOAMD64=v4, so there's little point in separating them
out.
Change-Id: I34356502bd1853ba2372e48db0b10d55cffe07a1
Reviewed-on: https://go-review.googlesource.com/c/go/+/680899
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'src/internal/cpu/cpu.go')
| -rw-r--r-- | src/internal/cpu/cpu.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/internal/cpu/cpu.go b/src/internal/cpu/cpu.go index 760dc0b469..a93eb54ddf 100644 --- a/src/internal/cpu/cpu.go +++ b/src/internal/cpu/cpu.go @@ -31,8 +31,11 @@ var X86 struct { HasADX bool HasAVX bool HasAVX2 bool + HasAVX512 bool // Virtual feature: F+CD+BW+DQ+VL HasAVX512F bool + HasAVX512CD bool HasAVX512BW bool + HasAVX512DQ bool HasAVX512VL bool HasBMI1 bool HasBMI2 bool @@ -160,6 +163,10 @@ var RISCV64 struct { //go:linkname S390X //go:linkname RISCV64 +// doDerived, if non-nil, is called after processing GODEBUG to set "derived" +// feature flags. +var doDerived func() + // Initialize examines the processor and sets the relevant variables above. // This is called by the runtime package early in program initialization, // before normal init functions are run. env is set by runtime if the OS supports @@ -167,6 +174,9 @@ var RISCV64 struct { func Initialize(env string) { doinit() processOptions(env) + if doDerived != nil { + doDerived() + } } // options contains the cpu debug options that can be used in GODEBUG. |