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authorDavid S. Miller <davem@davemloft.net>2014-04-30 12:57:51 -0700
committerDavid S. Miller <davem@davemloft.net>2014-05-01 12:15:06 -0700
commit5331255b6eeafa74865b2e6af627cb712c41dafd (patch)
treea9d5fe7cfb4ad4af1dcb12bad7e1b158d281eca5 /sysdeps/sparc/sparc64
parent4fdfe821e20a70670b3d03deb2abed5d8c83e51b (diff)
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Fix v9/64-bit strcmp when string ends in multiple zero bytes.
[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.
Diffstat (limited to 'sysdeps/sparc/sparc64')
-rw-r--r--sysdeps/sparc/sparc64/strcmp.S31
1 files changed, 31 insertions, 0 deletions
diff --git a/sysdeps/sparc/sparc64/strcmp.S b/sysdeps/sparc/sparc64/strcmp.S
index 8925396ec6..f32b0fc779 100644
--- a/sysdeps/sparc/sparc64/strcmp.S
+++ b/sysdeps/sparc/sparc64/strcmp.S
@@ -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