diff options
Diffstat (limited to 'src/vendor/golang.org/x/sys/cpu/cpu_x86.s')
| -rw-r--r-- | src/vendor/golang.org/x/sys/cpu/cpu_x86.s | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/vendor/golang.org/x/sys/cpu/cpu_x86.s b/src/vendor/golang.org/x/sys/cpu/cpu_x86.s index 2f557a5887..b748ba52f7 100644 --- a/src/vendor/golang.org/x/sys/cpu/cpu_x86.s +++ b/src/vendor/golang.org/x/sys/cpu/cpu_x86.s @@ -2,6 +2,7 @@ // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. +//go:build (386 || amd64 || amd64p32) && gc // +build 386 amd64 amd64p32 // +build gc @@ -25,3 +26,27 @@ TEXT ·xgetbv(SB),NOSPLIT,$0-8 MOVL AX, eax+0(FP) MOVL DX, edx+4(FP) RET + +// func darwinSupportsAVX512() bool +TEXT ·darwinSupportsAVX512(SB), NOSPLIT, $0-1 + MOVB $0, ret+0(FP) // default to false +#ifdef GOOS_darwin // return if not darwin +#ifdef GOARCH_amd64 // return if not amd64 +// These values from: +// https://github.com/apple/darwin-xnu/blob/xnu-4570.1.46/osfmk/i386/cpu_capabilities.h +#define commpage64_base_address 0x00007fffffe00000 +#define commpage64_cpu_capabilities64 (commpage64_base_address+0x010) +#define commpage64_version (commpage64_base_address+0x01E) +#define hasAVX512F 0x0000004000000000 + MOVQ $commpage64_version, BX + CMPW (BX), $13 // cpu_capabilities64 undefined in versions < 13 + JL no_avx512 + MOVQ $commpage64_cpu_capabilities64, BX + MOVQ $hasAVX512F, CX + TESTQ (BX), CX + JZ no_avx512 + MOVB $1, ret+0(FP) +no_avx512: +#endif +#endif + RET |