From: Matt Horsnell <matthew.horsnell@gmail.com>
Date: Fri, 13 Jan 2023 10:54:28 +0000 (+0000)
Subject: runtime: enable sha512 optimizations on arm64 via hwcaps.
X-Git-Tag: go1.21rc1~1830
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=b90971b292cd9a91f3c80e3c82e95541393393d7;p=gostls13.git

runtime: enable sha512 optimizations on arm64 via hwcaps.

Change-Id: I9d88c8eb91106de412a9abc6601cdda06537d818
Reviewed-on: https://go-review.googlesource.com/c/go/+/461747
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
---

diff --git a/src/internal/cpu/cpu_arm64_hwcap.go b/src/internal/cpu/cpu_arm64_hwcap.go
index 0fb5fb505a..88cb8b9064 100644
--- a/src/internal/cpu/cpu_arm64_hwcap.go
+++ b/src/internal/cpu/cpu_arm64_hwcap.go
@@ -19,6 +19,7 @@ const (
 	hwcap_CRC32   = 1 << 7
 	hwcap_ATOMICS = 1 << 8
 	hwcap_CPUID   = 1 << 11
+	hwcap_SHA512  = 1 << 21
 )
 
 func hwcapInit(os string) {
@@ -31,6 +32,7 @@ func hwcapInit(os string) {
 	ARM64.HasSHA2 = isSet(HWCap, hwcap_SHA2)
 	ARM64.HasCRC32 = isSet(HWCap, hwcap_CRC32)
 	ARM64.HasCPUID = isSet(HWCap, hwcap_CPUID)
+	ARM64.HasSHA512 = isSet(HWCap, hwcap_SHA512)
 
 	// The Samsung S9+ kernel reports support for atomics, but not all cores
 	// actually support them, resulting in SIGILL. See issue #28431.