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a41fe4 |
From 9bc2ed8f46d80859a5596789cc9e8cc2de84b0e7 Mon Sep 17 00:00:00 2001
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a41fe4 |
From: Wilco Dijkstra <wdijkstr@arm.com>
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a41fe4 |
Date: Tue, 10 Aug 2021 13:39:37 +0100
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a41fe4 |
Subject: [PATCH] [2/5] AArch64: Improve A64FX memset for large sizes
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a41fe4 |
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a41fe4 |
Improve performance of large memsets. Simplify alignment code. For zero memset
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a41fe4 |
use DC ZVA, which almost doubles performance. For non-zero memsets use the
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a41fe4 |
unroll8 loop which is about 10% faster.
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a41fe4 |
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a41fe4 |
Reviewed-by: Naohiro Tamura <naohirot@fujitsu.com>
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a41fe4 |
---
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a41fe4 |
sysdeps/aarch64/multiarch/memset_a64fx.S | 85 +++++++-----------------
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a41fe4 |
1 file changed, 25 insertions(+), 60 deletions(-)
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a41fe4 |
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a41fe4 |
diff --git a/sysdeps/aarch64/multiarch/memset_a64fx.S b/sysdeps/aarch64/multiarch/memset_a64fx.S
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a41fe4 |
index cf3d402ef6..75cf43ae79 100644
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a41fe4 |
--- a/sysdeps/aarch64/multiarch/memset_a64fx.S
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a41fe4 |
+++ b/sysdeps/aarch64/multiarch/memset_a64fx.S
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a41fe4 |
@@ -27,14 +27,11 @@
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a41fe4 |
*/
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a41fe4 |
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a41fe4 |
#define L1_SIZE (64*1024) // L1 64KB
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a41fe4 |
-#define L2_SIZE (8*1024*1024) // L2 8MB - 1MB
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a41fe4 |
+#define L2_SIZE (8*1024*1024) // L2 8MB
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a41fe4 |
#define CACHE_LINE_SIZE 256
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a41fe4 |
#define PF_DIST_L1 (CACHE_LINE_SIZE * 16) // Prefetch distance L1
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a41fe4 |
-#define ZF_DIST (CACHE_LINE_SIZE * 21) // Zerofill distance
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a41fe4 |
-#define rest x8
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a41fe4 |
+#define rest x2
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a41fe4 |
#define vector_length x9
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a41fe4 |
-#define vl_remainder x10 // vector_length remainder
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a41fe4 |
-#define cl_remainder x11 // CACHE_LINE_SIZE remainder
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a41fe4 |
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a41fe4 |
#if HAVE_AARCH64_SVE_ASM
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a41fe4 |
# if IS_IN (libc)
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a41fe4 |
@@ -42,14 +39,6 @@
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a41fe4 |
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a41fe4 |
.arch armv8.2-a+sve
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a41fe4 |
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a41fe4 |
- .macro dc_zva times
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a41fe4 |
- dc zva, tmp1
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a41fe4 |
- add tmp1, tmp1, CACHE_LINE_SIZE
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a41fe4 |
- .if \times-1
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a41fe4 |
- dc_zva "(\times-1)"
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a41fe4 |
- .endif
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a41fe4 |
- .endm
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a41fe4 |
-
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a41fe4 |
.macro st1b_unroll first=0, last=7
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a41fe4 |
st1b z0.b, p0, [dst, \first, mul vl]
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a41fe4 |
.if \last-\first
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a41fe4 |
@@ -188,54 +177,30 @@ L(L1_prefetch): // if rest >= L1_SIZE
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a41fe4 |
cbnz rest, L(unroll32)
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a41fe4 |
ret
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a41fe4 |
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a41fe4 |
-L(L2):
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a41fe4 |
- // align dst address at vector_length byte boundary
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a41fe4 |
- sub tmp1, vector_length, 1
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a41fe4 |
- ands tmp2, dst, tmp1
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a41fe4 |
- // if vl_remainder == 0
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a41fe4 |
- b.eq 1f
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a41fe4 |
- sub vl_remainder, vector_length, tmp2
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a41fe4 |
- // process remainder until the first vector_length boundary
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a41fe4 |
- whilelt p2.b, xzr, vl_remainder
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a41fe4 |
- st1b z0.b, p2, [dst]
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a41fe4 |
- add dst, dst, vl_remainder
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a41fe4 |
- sub rest, rest, vl_remainder
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a41fe4 |
- // align dstin address at CACHE_LINE_SIZE byte boundary
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a41fe4 |
-1: mov tmp1, CACHE_LINE_SIZE
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a41fe4 |
- ands tmp2, dst, CACHE_LINE_SIZE - 1
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a41fe4 |
- // if cl_remainder == 0
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a41fe4 |
- b.eq L(L2_dc_zva)
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a41fe4 |
- sub cl_remainder, tmp1, tmp2
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a41fe4 |
- // process remainder until the first CACHE_LINE_SIZE boundary
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a41fe4 |
- mov tmp1, xzr // index
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a41fe4 |
-2: whilelt p2.b, tmp1, cl_remainder
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a41fe4 |
- st1b z0.b, p2, [dst, tmp1]
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a41fe4 |
- incb tmp1
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a41fe4 |
- cmp tmp1, cl_remainder
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a41fe4 |
- b.lo 2b
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a41fe4 |
- add dst, dst, cl_remainder
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a41fe4 |
- sub rest, rest, cl_remainder
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a41fe4 |
-
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a41fe4 |
-L(L2_dc_zva):
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a41fe4 |
- // zero fill
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a41fe4 |
- mov tmp1, dst
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a41fe4 |
- dc_zva (ZF_DIST / CACHE_LINE_SIZE) - 1
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a41fe4 |
- mov zva_len, ZF_DIST
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a41fe4 |
- add tmp1, zva_len, CACHE_LINE_SIZE * 2
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a41fe4 |
- // unroll
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a41fe4 |
+ // count >= L2_SIZE
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a41fe4 |
.p2align 3
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
-1: st1b_unroll 0, 3
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- add tmp2, dst, zva_len
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- dc zva, tmp2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- st1b_unroll 4, 7
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- add tmp2, tmp2, CACHE_LINE_SIZE
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- dc zva, tmp2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- add dst, dst, CACHE_LINE_SIZE * 2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- sub rest, rest, CACHE_LINE_SIZE * 2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- cmp rest, tmp1 // ZF_DIST + CACHE_LINE_SIZE * 2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- b.ge 1b
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- cbnz rest, L(unroll8)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
- ret
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+L(L2):
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ tst valw, 255
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ b.ne L(unroll8)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ // align dst to CACHE_LINE_SIZE byte boundary
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ and tmp2, dst, CACHE_LINE_SIZE - 1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ st1b z0.b, p0, [dst, 0, mul vl]
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ st1b z0.b, p0, [dst, 1, mul vl]
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ st1b z0.b, p0, [dst, 2, mul vl]
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ st1b z0.b, p0, [dst, 3, mul vl]
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ sub dst, dst, tmp2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ add count, count, tmp2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ // clear cachelines using DC ZVA
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ sub count, count, CACHE_LINE_SIZE * 2
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ .p2align 4
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+1: add dst, dst, CACHE_LINE_SIZE
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ dc zva, dst
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ subs count, count, CACHE_LINE_SIZE
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ b.hi 1b
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ add count, count, CACHE_LINE_SIZE
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ add dst, dst, CACHE_LINE_SIZE
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
+ b L(last)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
END (MEMSET)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
libc_hidden_builtin_def (MEMSET)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
2.31.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
a41fe4 |
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