vendor: update buildkit to 539be170

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/golang.org/x/sys/cpu/cpu.go

@@ -56,6 +56,7 @@ var X86 struct {
 	HasAVX512BF16       bool // Advanced vector extension 512 BFloat16 Instructions
 	HasBMI1             bool // Bit manipulation instruction set 1
 	HasBMI2             bool // Bit manipulation instruction set 2
+	HasCX16             bool // Compare and exchange 16 Bytes
 	HasERMS             bool // Enhanced REP for MOVSB and STOSB
 	HasFMA              bool // Fused-multiply-add instructions
 	HasOSXSAVE          bool // OS supports XSAVE/XRESTOR for saving/restoring XMM registers.

vendor/golang.org/x/sys/cpu/cpu_x86.go

@@ -39,6 +39,7 @@ func initOptions() {
 		{Name: "avx512bf16", Feature: &X86.HasAVX512BF16},
 		{Name: "bmi1", Feature: &X86.HasBMI1},
 		{Name: "bmi2", Feature: &X86.HasBMI2},
+		{Name: "cx16", Feature: &X86.HasCX16},
 		{Name: "erms", Feature: &X86.HasERMS},
 		{Name: "fma", Feature: &X86.HasFMA},
 		{Name: "osxsave", Feature: &X86.HasOSXSAVE},
@@ -73,6 +74,7 @@ func archInit() {
 	X86.HasPCLMULQDQ = isSet(1, ecx1)
 	X86.HasSSSE3 = isSet(9, ecx1)
 	X86.HasFMA = isSet(12, ecx1)
+	X86.HasCX16 = isSet(13, ecx1)
 	X86.HasSSE41 = isSet(19, ecx1)
 	X86.HasSSE42 = isSet(20, ecx1)
 	X86.HasPOPCNT = isSet(23, ecx1)
@@ -88,9 +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)

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