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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/bz30944-memcpy-zen] x86: Expand the comment on when REP STOSB is used on memset Date: Fri, 27 Oct 2023 12:30:08 +0000 (GMT) [thread overview] Message-ID: <20231027123008.230ED3853519@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b0fe1533ff7283e765a2e590d210999ca045ca4c commit b0fe1533ff7283e765a2e590d210999ca045ca4c Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Fri Oct 27 08:14:14 2023 -0300 x86: Expand the comment on when REP STOSB is used on memset Diff: --- sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S index 3d9ad49cb9..0821b32997 100644 --- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S @@ -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>
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