internal/cpu: detect sha-ni instruction support for AMD64

    addresses proposal #53084
    required by sha-256 change list developed for #50543

Change-Id: I5454d746fce069a7a4993d70dc5b0a5544f8eeaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/408794
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@google.com>

diff --git a/src/internal/cpu/cpu.go b/src/internal/cpu/cpu.go
index c02dadccf6fd8f308020330a4366ee7d17c76aba..2d3fae12ae4dc3491cb64fc6691af6b069f7c720 100644 (file)
--- a/src/internal/cpu/cpu.go
+++ b/src/internal/cpu/cpu.go
@@ -37,6 +37,7 @@ var X86 struct {
        HasPCLMULQDQ bool
        HasPOPCNT    bool
        HasRDTSCP    bool
+       HasSHA       bool
        HasSSE3      bool
        HasSSSE3     bool
        HasSSE41     bool

diff --git a/src/internal/cpu/cpu_x86.go b/src/internal/cpu/cpu_x86.go
index 6fd979a7470ec19c18d2190af3ae1c64d54bacfe..96b8ef92b560df862e4042452f8851a627f51289 100644 (file)
--- a/src/internal/cpu/cpu_x86.go
+++ b/src/internal/cpu/cpu_x86.go
@@ -39,6 +39,7 @@ const (
        cpuid_BMI2 = 1 << 8
        cpuid_ERMS = 1 << 9
        cpuid_ADX  = 1 << 19
+       cpuid_SHA  = 1 << 29
 
        // edx bits for CPUID 0x80000001
        cpuid_RDTSCP = 1 << 27
@@ -53,6 +54,7 @@ func doinit() {
                {Name: "erms", Feature: &X86.HasERMS},
                {Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ},
                {Name: "rdtscp", Feature: &X86.HasRDTSCP},
+               {Name: "sha", Feature: &X86.HasSHA},
        }
        level := getGOAMD64level()
        if level < 2 {
@@ -125,6 +127,7 @@ func doinit() {
        X86.HasBMI2 = isSet(ebx7, cpuid_BMI2)
        X86.HasERMS = isSet(ebx7, cpuid_ERMS)
        X86.HasADX = isSet(ebx7, cpuid_ADX)
+       X86.HasSHA = isSet(ebx7, cpuid_SHA)
 
        var maxExtendedInformation uint32
        maxExtendedInformation, _, _, _ = cpuid(0x80000000, 0)