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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2021-05-23 19:43:24 -0400 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2021-05-23 22:50:49 -0400 |
| commit | 1b992204f68af851e905c16016756fd4421e1934 (patch) | |
| tree | c7961cb886d425352882a4cc6e36203c95460d24 | |
| parent | fc335a0ded2bcbade73f35c73eef66ff10eecdb8 (diff) | |
| download | glibc-1b992204f68af851e905c16016756fd4421e1934.tar.gz glibc-1b992204f68af851e905c16016756fd4421e1934.tar.xz glibc-1b992204f68af851e905c16016756fd4421e1934.zip | |
x86: Improve memmove-vec-unaligned-erms.S
This patch changes the condition for copy 4x VEC so that if length is exactly equal to 4 * VEC_SIZE it will use the 4x VEC case instead of 8x VEC case. Results For Skylake memcpy-avx2-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 0 , 9.137 , 6.873 , New , 75.22 128 , 7 , 0 , 12.933 , 7.732 , New , 59.79 128 , 0 , 7 , 11.852 , 6.76 , New , 57.04 128 , 7 , 7 , 12.587 , 6.808 , New , 54.09 Results For Icelake memcpy-evex-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 0 , 9.963 , 5.416 , New , 54.36 128 , 7 , 0 , 16.467 , 8.061 , New , 48.95 128 , 0 , 7 , 14.388 , 7.644 , New , 53.13 128 , 7 , 7 , 14.546 , 7.642 , New , 52.54 Results For Tigerlake memcpy-evex-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 0 , 8.979 , 4.95 , New , 55.13 128 , 7 , 0 , 14.245 , 7.122 , New , 50.0 128 , 0 , 7 , 12.668 , 6.675 , New , 52.69 128 , 7 , 7 , 13.042 , 6.802 , New , 52.15 Results For Skylake memmove-avx2-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 32 , 6.181 , 5.691 , New , 92.07 128 , 32 , 0 , 6.165 , 5.752 , New , 93.3 128 , 0 , 7 , 13.923 , 9.37 , New , 67.3 128 , 7 , 0 , 12.049 , 10.182 , New , 84.5 Results For Icelake memmove-evex-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 32 , 5.479 , 4.889 , New , 89.23 128 , 32 , 0 , 5.127 , 4.911 , New , 95.79 128 , 0 , 7 , 18.885 , 13.547 , New , 71.73 128 , 7 , 0 , 15.565 , 14.436 , New , 92.75 Results For Tigerlake memmove-evex-erms size, al1 , al2 , Cur T , New T , Win , New / Cur 128 , 0 , 32 , 5.275 , 4.815 , New , 91.28 128 , 32 , 0 , 5.376 , 4.565 , New , 84.91 128 , 0 , 7 , 19.426 , 14.273 , New , 73.47 128 , 7 , 0 , 15.924 , 14.951 , New , 93.89 Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
| -rw-r--r-- | sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S index 5e4a071f16..a783da5de2 100644 --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S @@ -420,8 +420,8 @@ L(more_2x_vec): cmpq $(VEC_SIZE * 8), %rdx ja L(more_8x_vec) cmpq $(VEC_SIZE * 4), %rdx - jb L(last_4x_vec) - /* Copy from 4 * VEC to 8 * VEC, inclusively. */ + jbe L(last_4x_vec) + /* Copy from 4 * VEC + 1 to 8 * VEC, inclusively. */ VMOVU (%rsi), %VEC(0) VMOVU VEC_SIZE(%rsi), %VEC(1) VMOVU (VEC_SIZE * 2)(%rsi), %VEC(2) @@ -440,7 +440,7 @@ L(more_2x_vec): VMOVU %VEC(7), -(VEC_SIZE * 4)(%rdi,%rdx) VZEROUPPER_RETURN L(last_4x_vec): - /* Copy from 2 * VEC to 4 * VEC. */ + /* Copy from 2 * VEC + 1 to 4 * VEC, inclusively. */ VMOVU (%rsi), %VEC(0) VMOVU VEC_SIZE(%rsi), %VEC(1) VMOVU -VEC_SIZE(%rsi,%rdx), %VEC(2) |