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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-01-30 10:59:15 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-02-24 09:46:15 -0800 |
| commit | 4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082 (patch) | |
| tree | 61dd7efdad17adb9047e1f6eaf6fe646d20b5d16 /ChangeLog | |
| parent | d012ea850680a2a94959f1c5136502a0f712b30a (diff) | |
| download | glibc-4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082.tar.gz glibc-4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082.tar.xz glibc-4d393a8831fc0ab1b7c29e2d5bafbdbfe2102082.zip | |
Add VZEROUPPER to memset-vec-unaligned-erms.S [BZ #21081]
Since memset-vec-unaligned-erms.S has VDUP_TO_VEC0_AND_SET_RETURN at
function entry, memset optimized for AVX2 and AVX512 will always use
ymm/zmm register. VZEROUPPER should be placed before ret in
L(stosb):
movq %rdx, %rcx
movzbl %sil, %eax
movq %rdi, %rdx
rep stosb
movq %rdx, %rax
ret
since it can be reached from
L(stosb_more_2x_vec):
cmpq $REP_STOSB_THRESHOLD, %rdx
ja L(stosb)
[BZ #21081]
* sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
(L(stosb)): Add VZEROUPPER before ret.
(cherry picked from commit 02b78ff749f0c88771713368dbb2a09b1979814f)
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index a9b7540017..1b7d40adc0 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2017-01-30 H.J. Lu <hongjiu.lu@intel.com> + + [BZ #21081] + * sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S + (L(stosb)): Add VZEROUPPER before ret. + 2016-11-28 H.J. Lu <hongjiu.lu@intel.com> [BZ #20750] |