From e69d9981f858a38e19304e6ff5ebdf89f2cb0ba0 Mon Sep 17 00:00:00 2001
From: Wilco Dijkstra <wdijkstr@arm.com>
Date: Tue, 10 Aug 2021 13:44:27 +0100
Subject: [PATCH] [4/5] AArch64: Improve A64FX memset by removing unroll32

Remove unroll32 code since it doesn't improve performance.

Reviewed-by: Naohiro Tamura <naohirot@fujitsu.com>
---
 sysdeps/aarch64/multiarch/memset_a64fx.S | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

diff --git a/sysdeps/aarch64/multiarch/memset_a64fx.S b/sysdeps/aarch64/multiarch/memset_a64fx.S
index 337c86be6f..ef0315658a 100644
--- a/sysdeps/aarch64/multiarch/memset_a64fx.S
+++ b/sysdeps/aarch64/multiarch/memset_a64fx.S
@@ -102,22 +102,6 @@ L(vl_agnostic): // VL Agnostic
 	ccmp	vector_length, tmp1, 0, cs
 	b.eq	L(L1_prefetch)
 
-L(unroll32):
-	lsl	tmp1, vector_length, 3	// vector_length * 8
-	lsl	tmp2, vector_length, 5	// vector_length * 32
-	.p2align 3
-1:	cmp	rest, tmp2
-	b.cc	L(unroll8)
-	st1b_unroll
-	add	dst, dst, tmp1
-	st1b_unroll
-	add	dst, dst, tmp1
-	st1b_unroll
-	add	dst, dst, tmp1
-	st1b_unroll
-	add	dst, dst, tmp1
-	sub	rest, rest, tmp2
-	b	1b
 
 L(unroll8):
 	lsl	tmp1, vector_length, 3
@@ -155,7 +139,7 @@ L(L1_prefetch): // if rest >= L1_SIZE
 	sub	rest, rest, CACHE_LINE_SIZE * 2
 	cmp	rest, L1_SIZE
 	b.ge	1b
-	cbnz	rest, L(unroll32)
+	cbnz	rest, L(unroll8)
 	ret
 
 	// count >= L2_SIZE
-- 
2.31.1

