From: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Mon, 6 Sep 2021 09:21:07 +0000 (+0100)
Subject: Revert "AArch64: Update A64FX memset not to degrade at 16KB"
X-Git-Tag: glibc-2.35~542
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f873adf3df443f8d302677f963adcc3c22187e68;p=thirdparty%2Fglibc.git

Revert "AArch64: Update A64FX memset not to degrade at 16KB"

Because of wrong commit author. Will recommit it with right author.

This reverts commit 23777232c23f80809613bdfa329f63aadf992922.
---

diff --git a/sysdeps/aarch64/multiarch/memset_a64fx.S b/sysdeps/aarch64/multiarch/memset_a64fx.S
index f7dfdaace7c..7bf759b6a75 100644
--- a/sysdeps/aarch64/multiarch/memset_a64fx.S
+++ b/sysdeps/aarch64/multiarch/memset_a64fx.S
@@ -96,14 +96,7 @@ L(vl_agnostic): // VL Agnostic
 L(unroll8):
 	sub	count, count, tmp1
 	.p2align 4
-	// The 2 instructions at the beginning of the following loop,
-	// cmp and branch, are a workaround so as not to degrade at
-	// the peak performance 16KB.
-	// It is found heuristically and the branch condition, b.ne,
-	// is chosen intentionally never to jump.
-1:	cmp	xzr, xzr
-	b.ne	1b
-	st1b_unroll 0, 7
+1:	st1b_unroll 0, 7
 	add	dst, dst, tmp1
 	subs	count, count, tmp1
 	b.hi	1b