diff options
Diffstat (limited to 'sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S')
| -rw-r--r-- | sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S b/sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S index 5d48898ffa..c8278ba36d 100644 --- a/sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S +++ b/sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S @@ -1,5 +1,5 @@ /* Optimized memchr with sse2 - Copyright (C) 2011-2016 Free Software Foundation, Inc. + Copyright (C) 2011-2018 Free Software Foundation, Inc. Contributed by Intel Corporation. This file is part of the GNU C Library. @@ -149,9 +149,15 @@ L(crosscache): .p2align 4 L(unaligned_no_match): # ifndef USE_AS_RAWMEMCHR - sub $16, %edx + /* Calculate the last acceptable address and check for possible + addition overflow by using satured math: + edx = ecx + edx + edx |= -(edx < ecx) */ add %ecx, %edx - jle L(return_null) + sbb %eax, %eax + or %eax, %edx + sub $16, %edx + jbe L(return_null) add $16, %edi # else add $16, %edx |