diff options
Diffstat (limited to 'vendor/golang.org/x/sys/cpu')
| -rw-r--r-- | vendor/golang.org/x/sys/cpu/cpu_gc_x86.go | 4 | ||||
| -rw-r--r-- | vendor/golang.org/x/sys/cpu/cpu_x86.go | 7 | ||||
| -rw-r--r-- | vendor/golang.org/x/sys/cpu/cpu_x86.s | 24 |
3 files changed, 4 insertions, 31 deletions
diff --git a/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go b/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go index 3298a87e..fa7cdb9b 100644 --- a/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go +++ b/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go @@ -15,7 +15,3 @@ func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32) // xgetbv with ecx = 0 is implemented in cpu_x86.s for gc compiler // and in cpu_gccgo.c for gccgo. func xgetbv() (eax, edx uint32) - -// darwinSupportsAVX512 is implemented in cpu_x86.s for gc compiler -// and in cpu_gccgo_x86.go for gccgo. -func darwinSupportsAVX512() bool diff --git a/vendor/golang.org/x/sys/cpu/cpu_x86.go b/vendor/golang.org/x/sys/cpu/cpu_x86.go index 5ea287b7..f5aacfc8 100644 --- a/vendor/golang.org/x/sys/cpu/cpu_x86.go +++ b/vendor/golang.org/x/sys/cpu/cpu_x86.go @@ -90,9 +90,10 @@ func archInit() { osSupportsAVX = isSet(1, eax) && isSet(2, eax) if runtime.GOOS == "darwin" { - // Check darwin commpage for AVX512 support. Necessary because: - // https://github.com/apple/darwin-xnu/blob/0a798f6738bc1db01281fc08ae024145e84df927/osfmk/i386/fpu.c#L175-L201 - osSupportsAVX512 = osSupportsAVX && darwinSupportsAVX512() + // Darwin doesn't save/restore AVX-512 mask registers correctly across signal handlers. + // Since users can't rely on mask register contents, let's not advertise AVX-512 support. + // See issue 49233. + osSupportsAVX512 = false } else { // Check if OPMASK and ZMM registers have OS support. osSupportsAVX512 = osSupportsAVX && isSet(5, eax) && isSet(6, eax) && isSet(7, eax) diff --git a/vendor/golang.org/x/sys/cpu/cpu_x86.s b/vendor/golang.org/x/sys/cpu/cpu_x86.s index b748ba52..39acab2f 100644 --- a/vendor/golang.org/x/sys/cpu/cpu_x86.s +++ b/vendor/golang.org/x/sys/cpu/cpu_x86.s @@ -26,27 +26,3 @@ 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 |