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Diffstat (limited to 'sysdeps/i386/i586/strlen.S')
-rw-r--r--sysdeps/i386/i586/strlen.S11
1 files changed, 4 insertions, 7 deletions
diff --git a/sysdeps/i386/i586/strlen.S b/sysdeps/i386/i586/strlen.S
index b807ed4b4f..15d01947d4 100644
--- a/sysdeps/i386/i586/strlen.S
+++ b/sysdeps/i386/i586/strlen.S
@@ -1,6 +1,6 @@
/* strlen -- Compute length og NUL terminated string.
Highly optimized version for ix86, x>=5.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
@@ -102,7 +102,6 @@ L1:
jnc L3 /* previous addl caused overflow? */
xorl %ecx, %edx /* (word+magic)^word */
- subl $magic, %ecx /* undo previous addl to restore word */
andl $~magic, %edx /* any of the carry flags set? */
@@ -119,7 +118,6 @@ L1:
jnc L3 /* previous addl caused overflow? */
xorl %ecx, %edx /* (word+magic)^word */
- subl $magic, %ecx /* undo previous addl to restore word */
andl $~magic, %edx /* any of the carry flags set? */
@@ -136,7 +134,6 @@ L1:
jnc L3 /* previous addl caused overflow? */
xorl %ecx, %edx /* (word+magic)^word */
- subl $magic, %ecx /* undo previous addl to restore word */
andl $~magic, %edx /* any of the carry flags set? */
@@ -149,11 +146,10 @@ L1:
subl %ecx, %edx /* first step to negate word */
addl $magic, %ecx /* add magic word */
- decl %edx /* wcomplete negation of ord */
+ decl %edx /* complete negation of word */
jnc L3 /* previous addl caused overflow? */
xorl %ecx, %edx /* (word+magic)^word */
- subl $magic, %ecx /* undo previous addl to restore word */
andl $~magic, %edx /* any of the carry flags set? */
@@ -161,8 +157,9 @@ L1:
L3: subl $4, %eax /* correct too early pointer increment */
- testb %cl, %cl /* lowest byte NUL? */
+ subl $magic, %ecx
+ cmpb $0, %cl /* lowest byte NUL? */
jz L2 /* yes => return */
inc %eax /* increment pointer */