mirror/glibc
2
0
Fork 0
mirror of git://sourceware.org/git/glibc.git synced 2024-11-27 03:41:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

x86: Only align destination to 1x VEC_SIZE in memset 4x loop

Browse Source 
Current code aligns to 2x VEC_SIZE. Aligning to 2x has no affect on
performance other than potentially resulting in an additional
iteration of the loop.
1x maintains aligned stores (the only reason to align in this case)
and doesn't incur any unnecessary loop iterations.
Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
This commit is contained in:
Noah Goldstein 2023-11-01 15:30:26 -05:00
parent 3921c5b40f
commit 9469261cf1
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
View File

@ -293,7 +293,7 @@ L(more_2x_vec):
leaq (VEC_SIZE * 4)(%rax), %LOOP_REG
#endif
/* Align dst for loop. */
andq $(VEC_SIZE * -2), %LOOP_REG
andq $(VEC_SIZE * -1), %LOOP_REG
.p2align 4
L(loop):
VMOVA %VMM(0), LOOP_4X_OFFSET(%LOOP_REG)