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x86: Expand the comment on when REP STOSB is used on memset

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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit 491e55beab)
This commit is contained in:
Adhemerval Zanella 2024-02-08 10:08:40 -03:00 committed by Arjun Shankar
parent 6484a92698
commit 5d070d12b3
1 changed files with 3 additions and 1 deletions
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sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
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@ -21,7 +21,9 @@
2. If size is less than VEC, use integer register stores.
3. If size is from VEC_SIZE to 2 * VEC_SIZE, use 2 VEC stores.
4. If size is from 2 * VEC_SIZE to 4 * VEC_SIZE, use 4 VEC stores.
5. If size is more to 4 * VEC_SIZE, align to 4 * VEC_SIZE with
5. On machines ERMS feature, if size is greater or equal than
__x86_rep_stosb_threshold then REP STOSB will be used.
6. If size is more to 4 * VEC_SIZE, align to 4 * VEC_SIZE with
4 VEC stores and store 4 * VEC at a time until done. */
#include <sysdep.h>