From 2036c9a59a6cb6e085d675d7ab26eb41bcbacdba Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Tue, 28 Jun 2011 12:33:58 +0000
Subject: [PATCH] md5-x86_86.pl: remove redundant instructions.

---
 crypto/md5/asm/md5-x86_64.pl | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/crypto/md5/asm/md5-x86_64.pl b/crypto/md5/asm/md5-x86_64.pl
index 867885435e..bc46f19387 100755
--- a/crypto/md5/asm/md5-x86_64.pl
+++ b/crypto/md5/asm/md5-x86_64.pl
@@ -25,8 +25,8 @@ sub round1_step
 	xor	$y,		%r11d		/* y ^ ... */
 	lea	$T_i($dst,%r10d),$dst		/* Const + dst + ... */
 	and	$x,		%r11d		/* x & ... */
-	xor	$z,		%r11d		/* z ^ ... */
 	mov	$k_next*4(%rsi),%r10d		/* (NEXT STEP) X[$k_next] */
+	xor	$z,		%r11d		/* z ^ ... */
 	add	%r11d,		$dst		/* dst += ... */
 	rol	\$$s,		$dst		/* dst <<< s */
 	mov	$y,		%r11d		/* (NEXT STEP) z' = $y */
@@ -43,7 +43,6 @@ EOF
 sub round2_step
 {
     my ($pos, $dst, $x, $y, $z, $k_next, $T_i, $s) = @_;
-    $code .= " mov	1*4(%rsi),	%r10d		/* (NEXT STEP) X[1] */\n" if ($pos == -1);
     $code .= " mov	%edx,		%r11d		/* (NEXT STEP) z' = %edx */\n" if ($pos == -1);
     $code .= " mov	%edx,		%r12d		/* (NEXT STEP) z' = %edx */\n" if ($pos == -1);
     $code .= <<EOF;
@@ -69,12 +68,11 @@ EOF
 sub round3_step
 {
     my ($pos, $dst, $x, $y, $z, $k_next, $T_i, $s) = @_;
-    $code .= " mov	5*4(%rsi),	%r10d		/* (NEXT STEP) X[5] */\n" if ($pos == -1);
     $code .= " mov	%ecx,		%r11d		/* (NEXT STEP) y' = %ecx */\n" if ($pos == -1);
     $code .= <<EOF;
 	lea	$T_i($dst,%r10d),$dst		/* Const + dst + ... */
-	mov	$k_next*4(%rsi),%r10d		/* (NEXT STEP) X[$k_next] */
 	xor	$z,		%r11d		/* z ^ ... */
+	mov	$k_next*4(%rsi),%r10d		/* (NEXT STEP) X[$k_next] */
 	xor	$x,		%r11d		/* x ^ ... */
 	add	%r11d,		$dst		/* dst += ... */
 	rol	\$$s,		$dst		/* dst <<< s */
@@ -91,16 +89,15 @@ EOF
 sub round4_step
 {
     my ($pos, $dst, $x, $y, $z, $k_next, $T_i, $s) = @_;
-    $code .= " mov	0*4(%rsi),	%r10d		/* (NEXT STEP) X[0] */\n" if ($pos == -1);
     $code .= " mov	\$0xffffffff,	%r11d\n" if ($pos == -1);
     $code .= " xor	%edx,		%r11d		/* (NEXT STEP) not z' = not %edx*/\n"
     if ($pos == -1);
     $code .= <<EOF;
 	lea	$T_i($dst,%r10d),$dst		/* Const + dst + ... */
 	or	$x,		%r11d		/* x | ... */
+	mov	$k_next*4(%rsi),%r10d		/* (NEXT STEP) X[$k_next] */
 	xor	$y,		%r11d		/* y ^ ... */
 	add	%r11d,		$dst		/* dst += ... */
-	mov	$k_next*4(%rsi),%r10d		/* (NEXT STEP) X[$k_next] */
 	mov	\$0xffffffff,	%r11d
 	rol	\$$s,		$dst		/* dst <<< s */
 	xor	$y,		%r11d		/* (NEXT STEP) not z' = not $y */
@@ -178,7 +175,7 @@ round1_step( 0,'%ebx','%ecx','%edx','%eax','12','0x895cd7be','22');
 round1_step( 0,'%eax','%ebx','%ecx','%edx','13','0x6b901122', '7');
 round1_step( 0,'%edx','%eax','%ebx','%ecx','14','0xfd987193','12');
 round1_step( 0,'%ecx','%edx','%eax','%ebx','15','0xa679438e','17');
-round1_step( 1,'%ebx','%ecx','%edx','%eax', '0','0x49b40821','22');
+round1_step( 1,'%ebx','%ecx','%edx','%eax', '1','0x49b40821','22');
 
 round2_step(-1,'%eax','%ebx','%ecx','%edx', '6','0xf61e2562', '5');
 round2_step( 0,'%edx','%eax','%ebx','%ecx','11','0xc040b340', '9');
@@ -195,7 +192,7 @@ round2_step( 0,'%ebx','%ecx','%edx','%eax','13','0x455a14ed','20');
 round2_step( 0,'%eax','%ebx','%ecx','%edx', '2','0xa9e3e905', '5');
 round2_step( 0,'%edx','%eax','%ebx','%ecx', '7','0xfcefa3f8', '9');
 round2_step( 0,'%ecx','%edx','%eax','%ebx','12','0x676f02d9','14');
-round2_step( 1,'%ebx','%ecx','%edx','%eax', '0','0x8d2a4c8a','20');
+round2_step( 1,'%ebx','%ecx','%edx','%eax', '5','0x8d2a4c8a','20');
 
 round3_step(-1,'%eax','%ebx','%ecx','%edx', '8','0xfffa3942', '4');
 round3_step( 0,'%edx','%eax','%ebx','%ecx','11','0x8771f681','11');
-- 
2.25.1