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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-02-15 08:18:15 -0600 |
|---|---|---|
| committer | Sunil K Pandey <skpgkp2@gmail.com> | 2022-05-25 15:07:28 -0700 |
| commit | 69f16619e7119e26d70c00ac8b8750ed350147a3 (patch) | |
| tree | 1738ded54d905fb4fdb94289f5d684301c85dbd3 | |
| parent | 7da0b8522b0498898f2b0d0b49f70869056e1e43 (diff) | |
| download | glibc-69f16619e7119e26d70c00ac8b8750ed350147a3.tar.gz glibc-69f16619e7119e26d70c00ac8b8750ed350147a3.tar.xz glibc-69f16619e7119e26d70c00ac8b8750ed350147a3.zip | |
x86: Fallback {str|wcs}cmp RTM in the ncmp overflow case [BZ #29127]
Re-cherry-pick commit c627209832 for strcmp-avx2.S change which was omitted in intial cherry pick because at the time this bug was not present on release branch. Fixes BZ #29127. In the overflow fallback strncmp-avx2-rtm and wcsncmp-avx2-rtm would call strcmp-avx2 and wcscmp-avx2 respectively. This would have not checks around vzeroupper and would trigger spurious aborts. This commit fixes that. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass on AVX2 machines with and without RTM. Co-authored-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit c6272098323153db373f2986c67786ea8c85f1cf)
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcmp-avx2.S | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S index aa91f6e48a..a9806daadb 100644 --- a/sysdeps/x86_64/multiarch/strcmp-avx2.S +++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S @@ -345,10 +345,10 @@ L(one_or_less): movq %LOCALE_REG, %rdx # endif jb L(ret_zero) -# ifdef USE_AS_WCSCMP /* 'nbe' covers the case where length is negative (large unsigned). */ - jnbe __wcscmp_avx2 + jnbe OVERFLOW_STRCMP +# ifdef USE_AS_WCSCMP movl (%rdi), %edx xorl %eax, %eax cmpl (%rsi), %edx @@ -357,10 +357,6 @@ L(one_or_less): negl %eax orl $1, %eax # else - /* 'nbe' covers the case where length is negative (large - unsigned). */ - - jnbe __strcmp_avx2 movzbl (%rdi), %eax movzbl (%rsi), %ecx TOLOWER_gpr (%rax, %eax) |