svn commit: r328397 - in stable/11/sys: amd64/amd64 i386/i386

[Konstantin Belousov]

Author: kib
Date: Thu Jan 25 15:28:43 2018
New Revision: 328397
URL: https://svnweb.freebsd.org/changeset/base/328397

Log:
  MFC r327820:
  Remove redundand CLD instructions.

Modified:
  stable/11/sys/amd64/amd64/support.S
  stable/11/sys/i386/i386/support.s
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/amd64/amd64/support.S
==============================================================================
--- stable/11/sys/amd64/amd64/support.S	Thu Jan 25 14:36:47 2018	(r328396)
+++ stable/11/sys/amd64/amd64/support.S	Thu Jan 25 15:28:43 2018	(r328397)
@@ -50,7 +50,6 @@ ENTRY(bzero)
 	movq	%rsi,%rcx
 	xorl	%eax,%eax
 	shrq	$3,%rcx
-	cld
 	rep
 	stosq
 	movq	%rsi,%rcx
@@ -76,7 +75,6 @@ ENTRY(bcmp)
 	PUSH_FRAME_POINTER
 	movq	%rdx,%rcx
 	shrq	$3,%rcx
-	cld					/* compare forwards */
 	repe
 	cmpsq
 	jne	1f
@@ -108,7 +106,6 @@ ENTRY(bcopy)
 	jb	1f
 
 	shrq	$3,%rcx				/* copy by 64-bit words */
-	cld					/* nope, copy forwards */
 	rep
 	movsq
 	movq	%rdx,%rcx
@@ -147,7 +144,6 @@ ENTRY(memcpy)
 	movq	%rdi,%rax
 	movq	%rdx,%rcx
 	shrq	$3,%rcx				/* copy by 64-bit words */
-	cld					/* copy forwards */
 	rep
 	movsq
 	movq	%rdx,%rcx
@@ -194,7 +190,6 @@ ENTRY(fillw)
 	movq	%rdi,%rax
 	movq	%rsi,%rdi
 	movq	%rdx,%rcx
-	cld
 	rep
 	stosw
 	POP_FRAME_POINTER
@@ -251,7 +246,6 @@ ENTRY(copyout)
 	movq	%rdx,%rcx
 
 	shrq	$3,%rcx
-	cld
 	rep
 	movsq
 	movb	%dl,%cl
@@ -300,7 +294,6 @@ ENTRY(copyin)
 	movq	%rdx,%rcx
 	movb	%cl,%al
 	shrq	$3,%rcx				/* copy longword-wise */
-	cld
 	rep
 	movsq
 	movb	%al,%cl
@@ -597,7 +590,6 @@ ENTRY(copyinstr)
 	movq	%rax,%r8
 1:
 	incq	%rdx
-	cld
 
 2:
 	decq	%rdx
@@ -648,7 +640,6 @@ ENTRY(copystr)
 
 	xchgq	%rdi,%rsi
 	incq	%rdx
-	cld
 1:
 	decq	%rdx
 	jz	4f

Modified: stable/11/sys/i386/i386/support.s
==============================================================================
--- stable/11/sys/i386/i386/support.s	Thu Jan 25 14:36:47 2018	(r328396)
+++ stable/11/sys/i386/i386/support.s	Thu Jan 25 15:28:43 2018	(r328397)
@@ -50,7 +50,6 @@ ENTRY(bzero)
 	movl	12(%esp),%ecx
 	xorl	%eax,%eax
 	shrl	$2,%ecx
-	cld
 	rep
 	stosl
 	movl	12(%esp),%ecx
@@ -83,7 +82,6 @@ ENTRY(i686_pagezero)
 
 	movl	12(%esp),%edi
 	movl	$1024,%ecx
-	cld
 
 	ALIGN_TEXT
 1:
@@ -134,7 +132,6 @@ ENTRY(fillw)
 	movl	8(%esp),%eax
 	movl	12(%esp),%edi
 	movl	16(%esp),%ecx
-	cld
 	rep
 	stosw
 	popl	%edi
@@ -151,7 +148,6 @@ ENTRY(bcopyb)
 	subl	%esi,%eax
 	cmpl	%ecx,%eax			/* overlapping && src < dst? */
 	jb	1f
-	cld					/* nope, copy forwards */
 	rep
 	movsb
 	popl	%edi
@@ -192,7 +188,6 @@ ENTRY(bcopy)
 	jb	1f
 
 	shrl	$2,%ecx				/* copy by 32-bit words */
-	cld					/* nope, copy forwards */
 	rep
 	movsl
 	movl	16(%ebp),%ecx
@@ -238,7 +233,6 @@ ENTRY(memcpy)
 	movl	20(%esp),%ecx
 	movl	%edi,%eax
 	shrl	$2,%ecx				/* copy by 32-bit words */
-	cld					/* nope, copy forwards */
 	rep
 	movsl
 	movl	20(%esp),%ecx
@@ -308,7 +302,6 @@ ENTRY(copyout)
 	movl	%ebx,%ecx
 
 	shrl	$2,%ecx
-	cld
 	rep
 	movsl
 	movb	%bl,%cl
@@ -359,7 +352,6 @@ ENTRY(copyin)
 
 	movb	%cl,%al
 	shrl	$2,%ecx				/* copy longword-wise */
-	cld
 	rep
 	movsl
 	movb	%al,%cl
@@ -576,7 +568,6 @@ ENTRY(copyinstr)
 	movl	%eax,20(%esp)
 1:
 	incl	%edx
-	cld
 
 2:
 	decl	%edx
@@ -629,7 +620,6 @@ ENTRY(copystr)
 	movl	16(%esp),%edi			/* %edi = to */
 	movl	20(%esp),%edx			/* %edx = maxlen */
 	incl	%edx
-	cld
 1:
 	decl	%edx
 	jz	4f
@@ -669,7 +659,6 @@ ENTRY(bcmp)
 
 	movl	%edx,%ecx
 	shrl	$2,%ecx
-	cld					/* compare forwards */
 	repe
 	cmpsl
 	jne	1f