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2010-10-25 Ulrich Drepper <drepper@redhat.com>
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[BZ #12159]
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* sysdeps/x86_64/multiarch/strchr.S: Fix propagation of search byte
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into all bytes of SSE register.
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Patch by Richard Li <richardpku@gmail.com>.
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Index: glibc-2.12-2-gc4ccff1/string/Makefile
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===================================================================
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--- glibc-2.12-2-gc4ccff1.orig/string/Makefile
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+++ glibc-2.12-2-gc4ccff1/string/Makefile
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@@ -55,7 +55,7 @@ tests := tester inl-tester noinl-tester
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tst-strtok tst-strxfrm bug-strcoll1 tst-strfry \
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bug-strtok1 $(addprefix test-,$(strop-tests)) \
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bug-envz1 tst-strxfrm2 tst-endian tst-svc2 \
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- bug-strstr1
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+ bug-strstr1 bug-strchr1
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distribute := memcopy.h pagecopy.h tst-svc.expect test-string.h \
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str-two-way.h
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Index: glibc-2.12-2-gc4ccff1/string/bug-strchr1.c
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===================================================================
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--- /dev/null
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+++ glibc-2.12-2-gc4ccff1/string/bug-strchr1.c
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@@ -0,0 +1,14 @@
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+#include <stdio.h>
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+#include <string.h>
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+
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+static int
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+do_test (void)
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+{
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+ char s[] __attribute__((aligned(16))) = "\xff";
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+ char *p = strchr (s, '\xfe');
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+ printf ("%p\n", p);
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+ return p != NULL;
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+}
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+
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+#define TEST_FUNCTION do_test ()
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+#include "../test-skeleton.c"
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Index: glibc-2.12-2-gc4ccff1/sysdeps/x86_64/multiarch/strchr.S
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===================================================================
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--- glibc-2.12-2-gc4ccff1.orig/sysdeps/x86_64/multiarch/strchr.S
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+++ glibc-2.12-2-gc4ccff1/sysdeps/x86_64/multiarch/strchr.S
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@@ -87,13 +87,13 @@ __strchr_sse42:
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pxor %xmm2, %xmm2
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movd %esi, %xmm1
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movl %edi, %ecx
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+ pshufb %xmm2, %xmm1
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andl $15, %ecx
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movq %rdi, %r8
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je L(aligned_start)
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/* Handle unaligned string. */
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andq $-16, %r8
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- pshufb %xmm2, %xmm1
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movdqa (%r8), %xmm0
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pcmpeqb %xmm0, %xmm2
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pcmpeqb %xmm1, %xmm0
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