From e33826f01bd78af76e0135c8dfab3387927a82bb Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Sun, 15 May 2016 17:01:15 +0200
Subject: Add assembly CRYPTO_memcmp.

GH: #102

Reviewed-by: Richard Levitte <levitte@openssl.org>
---
 crypto/x86_64cpuid.pl | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'crypto/x86_64cpuid.pl')

diff --git a/crypto/x86_64cpuid.pl b/crypto/x86_64cpuid.pl
index 450550bfb5..4946688d92 100644
--- a/crypto/x86_64cpuid.pl
+++ b/crypto/x86_64cpuid.pl
@@ -224,6 +224,28 @@ OPENSSL_cleanse:
 	jne	.Little
 	ret
 .size	OPENSSL_cleanse,.-OPENSSL_cleanse
+
+.globl  CRYPTO_memcmp
+.type   CRYPTO_memcmp,\@abi-omnipotent
+.align  16
+CRYPTO_memcmp:
+	xor	%rax,%rax
+	xor	%r10,%r10
+	cmp	\$0,$arg3
+	je	.Lno_data
+.Loop_cmp:
+	mov	($arg1),%r10b
+	lea	1($arg1),$arg1
+	xor	($arg2),%r10b
+	lea	1($arg2),$arg2
+	or	%r10b,%al
+	dec	$arg3
+	jnz	.Loop_cmp
+	neg	%rax
+	shr	\$63,%rax
+.Lno_data:
+	ret
+.size	CRYPTO_memcmp,.-CRYPTO_memcmp
 ___
 
 print<<___ if (!$win64);
-- 
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