Florian Weimer 3ec7c02cc3 x86-64: memcmp-avx2-movbe.S needs saturating subtraction [BZ #21662] ...

This code:

L(between_2_3):
	/* Load as big endian with overlapping loads and bswap to avoid
	   branches.  */
	movzwl	-2(%rdi, %rdx), %eax
	movzwl	-2(%rsi, %rdx), %ecx
	shll	$16, %eax
	shll	$16, %ecx
	movzwl	(%rdi), %edi
	movzwl	(%rsi), %esi
	orl	%edi, %eax
	orl	%esi, %ecx
	bswap	%eax
	bswap	%ecx
	subl	%ecx, %eax
	ret

needs a saturating subtract because the full register is used.
With this commit, only the lower 24 bits of the register are used,
so a regular subtraction suffices.

The test case change adds coverage for these kinds of bugs.

2017-06-23 17:24:40 +02:00

..

bits

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argz.h

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basename.c

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bcopy.c

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bug-envz1.c

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bug-strcoll1.c

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bug-strcoll2.c

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bug-strncat1.c

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bug-strpbrk1.c

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bug-strtok1.c

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bzero.c

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endian.h

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envz.c

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ffs.c

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ffsll.c

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inl-tester.c

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Makefile

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memccpy.c

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memchr.c

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memcmp.c

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memcpy.c

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memfrob.c

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memmem.c

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memmove.c

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memory.h

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mempcpy.c

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memrchr.c

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memset.c

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noinl-tester.c

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rawmemchr.c

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stpcpy.c

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str-two-way.h

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stratcliff.c

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strcasecmp_l.c

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strcasecmp.c

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strcasestr.c

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strcat.c

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strchr.c

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strchrnul.c

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strcmp.c

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strcoll_l.c

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strcoll.c

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strcpy.c

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strcspn.c

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strdup.c

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strerror_l.c

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strerror.c

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strfry.c

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string-inlines.c

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string.h

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strings.h

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strlen.c

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strncase_l.c

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strncase.c

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strncat.c

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strncmp.c

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strndup.c

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strnlen.c

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strpbrk.c

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strrchr.c

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strsep.c

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strsignal.c

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strspn.c

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strstr.c

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strtok_r.c

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strtok.c

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strverscmp.c

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strxfrm_l.c

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test-bcopy.c

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test-bzero.c

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test-endian-types.c

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test-explicit_bzero.c

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test-ffs.c

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test-memccpy.c

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test-memchr.c

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2017-05-25 11:38:01 -07:00

test-memcmp.c

x86-64: memcmp-avx2-movbe.S needs saturating subtraction [BZ #21662]

2017-06-23 17:24:40 +02:00

test-memcpy.c

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test-memmem.c

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test-memmove.c

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test-memrchr.c

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test-memset.c

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test-rawmemchr.c

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test-strcasecmp.c

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test-strcasestr.c

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test-strcat.c

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test-strchr.c

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test-strcmp.c

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test-strcpy.c

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test-strcspn.c

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test-string.h

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test-strlen.c

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test-strncasecmp.c

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test-strncat.c

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test-strncmp.c

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test-strncpy.c

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test-strnlen.c

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test-strpbrk.c

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test-strrchr.c

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test-strspn.c

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test-strstr.c

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testcopy.c

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tester.c

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tst-bswap.c

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tst-cmp.c

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tst-endian.c

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tst-inlcall.c

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tst-strcoll-overflow.c

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tst-strfry.c

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tst-strlen.c

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tst-strtok_r.c

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tst-strtok.c

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tst-strxfrm2.c

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tst-strxfrm.c

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tst-svc2.c

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tst-svc.c

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tst-svc.expect

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2009-04-07 06:51:59 +00:00

tst-svc.input

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tst-xbzero-opt.c

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Versions

New string function explicit_bzero (from OpenBSD).

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wordcopy.c

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