From: Wilco Dijkstra via Libc-alpha <libc-alpha@sourceware.org>
To: "naohirot@fujitsu.com" <naohirot@fujitsu.com>
Cc: 'GNU C Library' <libc-alpha@sourceware.org>
Subject: [PATCH v3 4/5] AArch64: Improve A64FX memset
Date: Thu, 22 Jul 2021 16:03:20 +0000 [thread overview]
Message-ID: <VE1PR08MB559925E4AA763668AEE7802583E49@VE1PR08MB5599.eurprd08.prod.outlook.com> (raw)
Remove unroll32 code since it doesn't improve performance.
---
diff --git a/sysdeps/aarch64/multiarch/memset_a64fx.S b/sysdeps/aarch64/multiarch/memset_a64fx.S
index fce257fa68120c2b101f29b438c397e10b4c275e..8665c272431b46dadea53c63ab74829c3aa99312 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
next reply other threads:[~2021-07-22 16:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-22 16:03 Wilco Dijkstra via Libc-alpha [this message]
2021-08-03 3:05 ` [PATCH v3 4/5] AArch64: Improve A64FX memset naohirot--- via Libc-alpha
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