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Fix v9/64-bit strcmp when string ends in multiple zero bytes.

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[BZ #16885]
	* sysdeps/sparc/sparc64/strcmp.S: Fix end comparison handling when
	multiple zero bytes exist at the end of a string.
	Reported by Aurelien Jarno <aurelien@aurel32.net>

	* string/test-strcmp.c (check): Add explicit test for situations where
	there are multiple zero bytes after the first.
This commit is contained in:
David S. Miller
2014-04-30 12:57:51 -07:00
parent 4fdfe821e2
commit 5331255b6e
3 changed files with 69 additions and 0 deletions
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31
sysdeps/sparc/sparc64/strcmp.S
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@ -121,6 +121,37 @@ ENTRY(strcmp)
movleu %xcc, -1, %o0
srlx rTMP1, 7, rTMP1
/* In order not to be influenced by bytes after the zero byte, we
* have to retain only the highest bit in the mask for the comparison
* with rSTRXOR to work properly.
*/
mov 0, rTMP2
andcc rTMP1, 0x0100, %g0
movne %xcc, 8, rTMP2
sllx rTMP1, 63 - 16, %o1
movrlz %o1, 16, rTMP2
sllx rTMP1, 63 - 24, %o1
movrlz %o1, 24, rTMP2
sllx rTMP1, 63 - 32, %o1
movrlz %o1, 32, rTMP2
sllx rTMP1, 63 - 40, %o1
movrlz %o1, 40, rTMP2
sllx rTMP1, 63 - 48, %o1
movrlz %o1, 48, rTMP2
sllx rTMP1, 63 - 56, %o1
movrlz %o1, 56, rTMP2
srlx rTMP1, rTMP2, rTMP1
sllx rTMP1, rTMP2, rTMP1
cmp rTMP1, rSTRXOR
retl
movgu %xcc, 0, %o0