3754ca0af2
Like the CL 487295, when implementing Lowered{Move,Zero}, 8 is first subtracted
from Rarg0 (parameter Ptr), and then the offset of 8 is added during subsequent
operations on Rarg0. This operation is meaningless, so delete it.
Change LoweredMove's Rarg0 register to R20, consistent with duffcopy.
goos: linux
goarch: loong64
pkg: runtime
cpu: Loongson-3C5000 @ 2200.00MHz
│ old.bench │ new.bench │
│ sec/op │ sec/op vs base │
Memmove/15 19.10n ± 0% 19.10n ± 0% ~ (p=0.483 n=15)
MemmoveUnalignedDst/15 25.02n ± 0% 25.02n ± 0% ~ (p=0.741 n=15)
MemmoveUnalignedDst/32 48.22n ± 0% 48.22n ± 0% ~ (p=1.000 n=15) ¹
MemmoveUnalignedDst/64 90.57n ± 0% 90.52n ± 0% ~ (p=0.212 n=15)
MemmoveUnalignedDstOverlap/32 44.12n ± 0% 44.13n ± 0% +0.02% (p=0.000 n=15)
MemmoveUnalignedDstOverlap/64 87.79n ± 0% 87.80n ± 0% +0.01% (p=0.002 n=15)
MemmoveUnalignedSrc/0 3.639n ± 0% 3.639n ± 0% ~ (p=1.000 n=15) ¹
MemmoveUnalignedSrc/1 7.733n ± 0% 7.733n ± 0% ~ (p=1.000 n=15)
MemmoveUnalignedSrc/2 9.097n ± 0% 9.097n ± 0% ~ (p=1.000 n=15)
MemmoveUnalignedSrc/3 10.46n ± 0% 10.46n ± 0% ~ (p=1.000 n=15) ¹
MemmoveUnalignedSrc/4 11.83n ± 0% 11.83n ± 0% ~ (p=1.000 n=15) ¹
MemmoveUnalignedSrc/64 93.71n ± 0% 93.70n ± 0% ~ (p=0.128 n=15)
Memclr/4096 699.1n ± 0% 699.1n ± 0% ~ (p=0.682 n=15)
Memclr/65536 11.18µ ± 0% 11.18µ ± 0% -0.01% (p=0.000 n=15)
Memclr/1M 175.2µ ± 0% 175.2µ ± 0% ~ (p=0.191 n=15)
Memclr/4M 661.8µ ± 0% 662.0µ ± 0% ~ (p=0.486 n=15)
MemclrUnaligned/4_5 19.39n ± 0% 20.47n ± 0% +5.57% (p=0.000 n=15)
MemclrUnaligned/4_16 22.29n ± 0% 21.38n ± 0% -4.08% (p=0.000 n=15)
MemclrUnaligned/4_64 30.58n ± 0% 29.81n ± 0% -2.52% (p=0.000 n=15)
MemclrUnaligned/4_65536 11.19µ ± 0% 11.20µ ± 0% +0.02% (p=0.000 n=15)
GoMemclr/5 12.73n ± 0% 12.73n ± 0% ~ (p=0.261 n=15)
GoMemclr/16 10.01n ± 0% 10.00n ± 0% ~ (p=0.264 n=15)
GoMemclr/256 50.94n ± 0% 50.94n ± 0% ~ (p=0.372 n=15)
ClearFat15 14.95n ± 0% 15.01n ± 4% ~ (p=0.925 n=15)
ClearFat1032 125.5n ± 0% 125.6n ± 0% +0.08% (p=0.000 n=15)
CopyFat64 10.58n ± 0% 10.01n ± 0% -5.39% (p=0.000 n=15)
CopyFat1040 244.3n ± 0% 155.6n ± 0% -36.31% (p=0.000 n=15)
Issue18740/2byte 29.82µ ± 0% 29.82µ ± 0% ~ (p=0.648 n=30)
Issue18740/4byte 18.18µ ± 0% 18.18µ ± 0% -0.02% (p=0.001 n=30)
Issue18740/8byte 8.395µ ± 0% 8.395µ ± 0% ~ (p=0.401 n=30)
geomean 154.5n 151.8n -1.70%
¹ all samples are equal
Change-Id: Ia3f3c8b25e1e93c97ab72328651de78ca9dec016
Reviewed-on: https://go-review.googlesource.com/c/go/+/488515
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Meidan Li <limeidan@loongson.cn>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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