diff options
Diffstat (limited to 'sysdeps/i386/i586')
| -rw-r--r-- | sysdeps/i386/i586/strlen.S | 11 |
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 */ |