Attachment 5660 Details for Bug 12518 – Patch to check for overlaps

[patch] Patch to check for overlaps

0001-memcpy-overlap-test.patch (text/plain), 1.73 KB, created by Felipe Contreras on 2011-04-10 15:49:59 UTC

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Creator: Felipe Contreras

Created: 2011-04-10 15:49:59 UTC

Size: 1.73 KB

patch

obsolete

>From 3d1895e17136b4a565ffefd37c02a159664017ed Mon Sep 17 00:00:00 2001
>From: Felipe Contreras <felipe.contreras@gmail.com>
>Date: Sun, 10 Apr 2011 17:29:44 +0300
>Subject: [PATCH] memcpy overlap test
>
>Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
>---
> sysdeps/x86_64/multiarch/memcpy-ssse3-back.S |   11 +++++++++++
> sysdeps/x86_64/multiarch/memcpy-ssse3.S      |   11 +++++++++++
> 2 files changed, 22 insertions(+), 0 deletions(-)
>
>diff --git a/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S b/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
>index 48c974e..4e3ee78 100644
>--- a/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
>+++ b/sysdeps/x86_64/multiarch/memcpy-ssse3-back.S
>@@ -57,6 +57,17 @@ END (MEMCPY_CHK)
> #endif
> 
> ENTRY (MEMCPY)
>+#ifndef USE_AS_MEMMOVE
>+	lea	(%rsi, %rdx), %r9
>+	lea	(%rdi, %rdx), %r11
>+	cmp	%r9, %rdi		/* dest start >= source end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	cmp	%r11, %rsi		/* source start >= destination end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	movb	$0, 0
>+	L(nonoverlap):
>+#endif
>+
> 	mov	%rdi, %rax
> #ifdef USE_AS_MEMPCPY
> 	add	%rdx, %rax
>diff --git a/sysdeps/x86_64/multiarch/memcpy-ssse3.S b/sysdeps/x86_64/multiarch/memcpy-ssse3.S
>index 9a878d3..cc316e8 100644
>--- a/sysdeps/x86_64/multiarch/memcpy-ssse3.S
>+++ b/sysdeps/x86_64/multiarch/memcpy-ssse3.S
>@@ -57,6 +57,17 @@ END (MEMCPY_CHK)
> #endif
> 
> ENTRY (MEMCPY)
>+#ifndef USE_AS_MEMMOVE
>+	lea	(%rsi, %rdx), %r9
>+	lea	(%rdi, %rdx), %r11
>+	cmp	%r9, %rdi		/* dest start >= source end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	cmp	%r11, %rsi		/* source start >= destination end */
>+	jae	L(nonoverlap)		/*  -> nonoverlapping */
>+	movb	$0, 0
>+	L(nonoverlap):
>+#endif
>+
> 	mov	%rdi, %rax
> #ifdef USE_AS_MEMPCPY
> 	add	%rdx, %rax
>-- 
>1.7.5.rc1
>

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