it should not be necessary to clear the direction flag

ok deraadt

16 files changed, 8 insertions, 26 deletions

diff --git a/sys/lib/libkern/arch/amd64/bcmp.S b/sys/lib/libkern/arch/amd64/bcmp.S
index 3c96a90b340..4cb1b3d6894 100644
--- a/sys/lib/libkern/arch/amd64/bcmp.S
+++ b/sys/lib/libkern/arch/amd64/bcmp.S
@@ -2,7 +2,6 @@
 
 ENTRY(bcmp)
 	xorl	%eax,%eax		/* clear return value */
-	cld				/* set compare direction forward */
 
 	movq	%rdx,%rcx		/* compare by words */
 	shrq	$3,%rcx
diff --git a/sys/lib/libkern/arch/amd64/bzero.S b/sys/lib/libkern/arch/amd64/bzero.S
index 76adafc20ab..354e2066ed3 100644
--- a/sys/lib/libkern/arch/amd64/bzero.S
+++ b/sys/lib/libkern/arch/amd64/bzero.S
@@ -9,7 +9,6 @@
 ENTRY(bzero)
 	movq	%rsi,%rdx
 
-	cld				/* set fill direction forward */
 	xorq	%rax,%rax		/* set fill data to 0 */
 
 	/*
diff --git a/sys/lib/libkern/arch/amd64/memchr.S b/sys/lib/libkern/arch/amd64/memchr.S
index 88fa37462d2..1738e17f8ee 100644
--- a/sys/lib/libkern/arch/amd64/memchr.S
+++ b/sys/lib/libkern/arch/amd64/memchr.S
@@ -11,7 +11,6 @@ ENTRY(memchr)
 	movq	%rdx,%rcx		/* set length of search */
 	testq	%rcx,%rcx		/* test for len == 0 */
 	jz	L1
-	cld				/* set search forward */
 	repne				/* search! */
 	scasb
 	jne	L1			/* scan failed, return null */
diff --git a/sys/lib/libkern/arch/amd64/memcmp.S b/sys/lib/libkern/arch/amd64/memcmp.S
index d32c66d5b93..0d97f6a9bd2 100644
--- a/sys/lib/libkern/arch/amd64/memcmp.S
+++ b/sys/lib/libkern/arch/amd64/memcmp.S
@@ -7,7 +7,6 @@
 #include <machine/asm.h>
 
 ENTRY(memcmp)
-	cld				/* set compare direction forward */
 	movq	%rdx,%rcx		/* compare by longs */
 	shrq	$3,%rcx
 	repe
diff --git a/sys/lib/libkern/arch/amd64/memmove.S b/sys/lib/libkern/arch/amd64/memmove.S
index 1516c743660..351e4d53a49 100644
--- a/sys/lib/libkern/arch/amd64/memmove.S
+++ b/sys/lib/libkern/arch/amd64/memmove.S
@@ -57,7 +57,6 @@ ENTRY(memcpy)
 	movq	%rdi,%r11	/* save dest */
 	movq	%rdx,%rcx
 2:
-	cld			/* copy forwards. */
 	shrq	$3,%rcx		/* copy by words */
 	rep
 	movsq
diff --git a/sys/lib/libkern/arch/amd64/memset.S b/sys/lib/libkern/arch/amd64/memset.S
index 670d9426b13..67d6404e932 100644
--- a/sys/lib/libkern/arch/amd64/memset.S
+++ b/sys/lib/libkern/arch/amd64/memset.S
@@ -12,8 +12,6 @@ ENTRY(memset)
 	movq	%rdx,%rcx
 	movq	%rdi,%r11
 
-	cld				/* set fill direction forward */
-
 	/*
 	 * if the string is too short, it's really not worth the overhead
 	 * of aligning to word boundaries, etc.  So we jump to a plain
diff --git a/sys/lib/libkern/arch/amd64/scanc.S b/sys/lib/libkern/arch/amd64/scanc.S
index f125ed295d3..4ecaae3c15b 100644
--- a/sys/lib/libkern/arch/amd64/scanc.S
+++ b/sys/lib/libkern/arch/amd64/scanc.S
@@ -43,7 +43,6 @@ ENTRY(scanc)
 	jz	2f
 	movq	%r11,%rdi
 	xorq	%rax,%rax
-	cld
 1:
 	lodsb
 	testb	%dl,(%rax,%rdi)
diff --git a/sys/lib/libkern/arch/amd64/skpc.S b/sys/lib/libkern/arch/amd64/skpc.S
index 7addfa9b74e..5942a1c07e8 100644
--- a/sys/lib/libkern/arch/amd64/skpc.S
+++ b/sys/lib/libkern/arch/amd64/skpc.S
@@ -39,7 +39,6 @@ ENTRY(skpc)
 	movl	%edi,%eax
 	movq	%rsi,%rcx
 	movq	%rdx,%rdi
-	cld
 	repe
 	scasb
 	je	1f
diff --git a/sys/lib/libkern/arch/i386/bcmp.S b/sys/lib/libkern/arch/i386/bcmp.S
index e1284525257..cfe197f82b3 100644
--- a/sys/lib/libkern/arch/i386/bcmp.S
+++ b/sys/lib/libkern/arch/i386/bcmp.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bcmp.S,v 1.2 1996/09/27 06:47:44 mickey Exp $	*/
+/*	$OpenBSD: bcmp.S,v 1.3 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*
  * Written by J.T. Conklin <jtc@netbsd.org>.
@@ -13,7 +13,6 @@ ENTRY(bcmp)
 	movl	12(%esp),%edi
 	movl	16(%esp),%esi
 	xorl	%eax,%eax		/* clear return value */
-	cld				/* set compare direction forward */
 
 	movl	20(%esp),%ecx		/* compare by words */
 	shrl	$2,%ecx
diff --git a/sys/lib/libkern/arch/i386/bzero.S b/sys/lib/libkern/arch/i386/bzero.S
index 3bf97192de3..82b64b4d663 100644
--- a/sys/lib/libkern/arch/i386/bzero.S
+++ b/sys/lib/libkern/arch/i386/bzero.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bzero.S,v 1.4 2007/11/25 18:25:35 deraadt Exp $	*/
+/*	$OpenBSD: bzero.S,v 1.5 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*
  * Written by J.T. Conklin <jtc@netbsd.org>.
@@ -13,7 +13,6 @@ ENTRY(bzero)
 	movl	8(%esp),%edi
 	movl	12(%esp),%edx
 
-	cld				/* set fill direction forward */
 	xorl	%eax,%eax		/* set fill data to 0 */
 
 	/*
diff --git a/sys/lib/libkern/arch/i386/memchr.S b/sys/lib/libkern/arch/i386/memchr.S
index 43f7a91e0a1..a09bad1c87b 100644
--- a/sys/lib/libkern/arch/i386/memchr.S
+++ b/sys/lib/libkern/arch/i386/memchr.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: memchr.S,v 1.1 1997/11/04 19:08:06 chuck Exp $	*/
+/*	$OpenBSD: memchr.S,v 1.2 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*
  * Written by J.T. Conklin <jtc@netbsd.org>.
@@ -14,7 +14,6 @@ ENTRY(memchr)
 	movl	16(%esp),%ecx		/* set length of search */
 	testl	%ecx,%ecx		/* test for len == 0 */
 	jz	L1
-	cld				/* set search forward */
 	repne				/* search! */
 	scasb
 	jne	L1			/* scan failed, return null */
diff --git a/sys/lib/libkern/arch/i386/memcmp.S b/sys/lib/libkern/arch/i386/memcmp.S
index 4ad4fd46469..1e28d7f4f66 100644
--- a/sys/lib/libkern/arch/i386/memcmp.S
+++ b/sys/lib/libkern/arch/i386/memcmp.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: memcmp.S,v 1.1 2000/06/16 19:56:54 millert Exp $	*/
+/*	$OpenBSD: memcmp.S,v 1.2 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*
  * Written by J.T. Conklin <jtc@netbsd.org>.
@@ -12,7 +12,6 @@ ENTRY(memcmp)
 	pushl	%esi
 	movl	12(%esp),%edi
 	movl	16(%esp),%esi
-	cld				/* set compare direction forward */
 
 	movl	20(%esp),%ecx		/* compare by words */
 	shrl	$2,%ecx
diff --git a/sys/lib/libkern/arch/i386/memmove.S b/sys/lib/libkern/arch/i386/memmove.S
index a88b08a5114..9e6edf290b2 100644
--- a/sys/lib/libkern/arch/i386/memmove.S
+++ b/sys/lib/libkern/arch/i386/memmove.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: memmove.S,v 1.6 2014/01/09 05:39:41 tedu Exp $	*/
+/*	$OpenBSD: memmove.S,v 1.7 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*-
  * Copyright (c) 1993, 1994, 1995 Charles M. Hannum.  All rights reserved.
@@ -74,7 +74,6 @@ ENTRY(memcpy)
 	movl	20(%esp),%ecx
 docopyf:
 	movl	%edi,%eax		# setup return value for memcpy/memmove
-	cld				# copy forward
 	shrl	$2,%ecx			# copy by 32-bit words
 	rep
 	movsl
diff --git a/sys/lib/libkern/arch/i386/memset.S b/sys/lib/libkern/arch/i386/memset.S
index 46bfd06fbc2..f95f7bac317 100644
--- a/sys/lib/libkern/arch/i386/memset.S
+++ b/sys/lib/libkern/arch/i386/memset.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: memset.S,v 1.3 2007/05/25 20:32:29 krw Exp $	*/
+/*	$OpenBSD: memset.S,v 1.4 2014/11/29 18:51:23 tedu Exp $	*/
 
 /*
  * Written by J.T. Conklin <jtc@netbsd.org>.
@@ -15,8 +15,6 @@ ENTRY(memset)
 	movl	20(%esp),%ecx
 	pushl	%edi			/* push address of buffer */
 
-	cld				/* set fill direction forward */
-
 	/*
 	 * if the string is too short, it's really not worth the overhead
 	 * of aligning to word boundaries, etc.  So we jump to a plain
diff --git a/sys/lib/libkern/arch/i386/scanc.S b/sys/lib/libkern/arch/i386/scanc.S
index 45759a1d43d..cc36a7878af 100644
--- a/sys/lib/libkern/arch/i386/scanc.S
+++ b/sys/lib/libkern/arch/i386/scanc.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: scanc.S,v 1.2 1996/09/27 06:47:48 mickey Exp $	*/
+/*	$OpenBSD: scanc.S,v 1.3 2014/11/29 18:51:23 tedu Exp $	*/
 /*	$NetBSD: scanc.S,v 1.5 1994/10/26 06:39:13 cgd Exp $	*/
 
 /*
@@ -42,7 +42,6 @@ ENTRY(scanc)
 	movl	20(%esp),%edi
 	movb	24(%esp),%dl
 	xorl	%eax,%eax
-	cld
 1:
 	lodsb
 	testb	%dl,(%eax,%edi)
diff --git a/sys/lib/libkern/arch/i386/skpc.S b/sys/lib/libkern/arch/i386/skpc.S
index 7f21c1e1fa8..05f4b0484f8 100644
--- a/sys/lib/libkern/arch/i386/skpc.S
+++ b/sys/lib/libkern/arch/i386/skpc.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: skpc.S,v 1.2 1996/09/27 06:47:49 mickey Exp $	*/
+/*	$OpenBSD: skpc.S,v 1.3 2014/11/29 18:51:23 tedu Exp $	*/
 /*	$NetBSD: skpc.S,v 1.2 1994/10/26 06:39:15 cgd Exp $	*/
 
 /*
@@ -37,7 +37,6 @@ ENTRY(skpc)
 	movl	16(%esp),%edi
 	movl	12(%esp),%ecx
 	movl	8(%esp),%eax
-	cld
 	repe
 	scasb
 	je	1f