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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 337c86b..ef03156 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
--
1.8.3.1
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