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)
2018-09-29 07:40:52 +00:00 · 2018-09-29 07:40:52 +00:00 · 275c893dab
commit 275c893dab
parent 9d967dd27d
1 changed files with 0 additions and 1 deletions
--- a/lib/libc/amd64/string/bcopy.S
+++ b/lib/libc/amd64/string/bcopy.S
@ -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