Author: mjg
Date: Sat Sep 29 07:40:52 2018
New Revision: 339011
URL: https://svnweb.freebsd.org/changeset/base/339011
Log:
amd64: remove unnecessary cld from libc memcpy/bcopy
The ABI specifies the direction forward on function call, making
the cld instruction redundant.
Approved by: re (kib)
Modified:
head/lib/libc/amd64/string/bcopy.S
Modified: head/lib/libc/amd64/string/bcopy.S
==============================================================================
--- head/lib/libc/amd64/string/bcopy.S Sat Sep 29 06:54:52 2018
(r339010)
+++ head/lib/libc/amd64/string/bcopy.S Sat Sep 29 07:40:52 2018
(r339011)
@@ -60,7 +60,6 @@ ENTRY(bcopy)
subq %rsi,%r8
cmpq %rcx,%r8 /* overlapping? */
jb 1f
- cld /* nope, copy forwards. */
shrq $3,%rcx /* copy by words */
rep
movsq
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