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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-02-06 00:54:18 -0600 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-02-06 20:58:07 -0600 |
| commit | b62ace2740a106222e124cc86956448fa07abf4d (patch) | |
| tree | 33113f4227f89fc389d82ec9a14834bb364704bb /sysdeps/nios2/Makefile | |
| parent | d7fca835e064ead5a46914d5f3a2eda3cad5649f (diff) | |
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x86: Improve vec generation in memset-vec-unaligned-erms.S
No bug.
Split vec generation into multiple steps. This allows the
broadcast in AVX2 to use 'xmm' registers for the L(less_vec)
case. This saves an expensive lane-cross instruction and removes
the need for 'vzeroupper'.
For SSE2 replace 2x 'punpck' instructions with zero-idiom 'pxor' for
byte broadcast.
Results for memset-avx2 small (geomean of N = 20 benchset runs).
size, New Time, Old Time, New / Old
0, 4.100, 3.831, 0.934
1, 5.074, 4.399, 0.867
2, 4.433, 4.411, 0.995
4, 4.487, 4.415, 0.984
8, 4.454, 4.396, 0.987
16, 4.502, 4.443, 0.987
All relevant string/wcsmbs tests are passing.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Diffstat (limited to 'sysdeps/nios2/Makefile')
0 files changed, 0 insertions, 0 deletions