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The Go programming language
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a8edd99479
The unrolled loop for sizes >= 4KB is further optimized.
Offsets are computed and included in the XC instruction directly.
This reduces code size and instructions, improves performance.
goos: linux
goarch: s390x
pkg: runtime
| Orig_Memclr_for_benchstat_2.log | MM_Memclr_for_benchstat_No_VSTL_3.log |
| sec/op | sec/op vs base |
Memclr/5 1.925n ± 0% 1.925n ± 0% ~ (p=0.211 n=10)
Memclr/16 2.604n ± 13% 2.633n ± 11% ~ (p=0.912 n=10)
Memclr/64 3.598n ± 2% 3.520n ± 5% ~ (p=0.190 n=10)
Memclr/256 3.571n ± 12% 3.538n ± 11% ~ (p=0.739 n=10)
Memclr/4096 15.15n ± 0% 15.14n ± 0% ~ (p=0.204 n=10)
Memclr/65536 226.3n ± 0% 224.9n ± 0% -0.62% (p=0.000 n=10)
Memclr/1M 12.77µ ± 0% 12.60µ ± 0% -1.35% (p=0.000 n=10)
Memclr/4M 51.07µ ± 0% 50.37µ ± 0% -1.38% (p=0.000 n=10)
Memclr/8M 102.1µ ± 0% 100.7µ ± 0% -1.36% (p=0.000 n=10)
Memclr/16M 204.4µ ± 0% 201.6µ ± 0% -1.35% (p=0.000 n=10)
Memclr/64M 965.4µ ± 0% 935.3µ ± 0% -3.12% (p=0.000 n=10)
MemclrUnaligned/0_5 2.671n ± 6% 2.618n ± 0% ~ (p=0.194 n=10)
MemclrUnaligned/0_16 3.143n ± 6% 2.955n ± 8% ~ (p=0.089 n=10)
MemclrUnaligned/0_64 3.622n ± 3% 3.571n ± 2% ~ (p=0.304 n=10)
MemclrUnaligned/0_256 3.712n ± 8% 3.653n ± 5% ~ (p=0.754 n=10)
MemclrUnaligned/0_4096 15.14n ± 0% 15.14n ± 0% ~ (p=1.000 n=10) ¹
MemclrUnaligned/0_65536 231.9n ± 0% 225.2n ± 0% -2.91% (p=0.000 n=10)
MemclrUnaligned/1_5 2.620n ± 8% 2.620n ± 0% ~ (p=0.866 n=10)
MemclrUnaligned/1_16 3.103n ± 7% 2.933n ± 9% ~ (p=0.052 n=10)
MemclrUnaligned/1_64 3.576n ± 3% 3.568n ± 3% ~ (p=0.748 n=10)
MemclrUnaligned/1_256 3.744n ± 9% 3.709n ± 10% ~ (p=0.853 n=10)
MemclrUnaligned/1_4096 26.23n ± 0% 26.23n ± 0% ~ (p=1.000 n=10) ¹
MemclrUnaligned/1_65536 401.1n ± 0% 399.5n ± 0% -0.40% (p=0.000 n=10)
MemclrUnaligned/4_5 2.620n ± 6% 2.623n ± 0% ~ (p=0.985 n=10)
MemclrUnaligned/4_16 3.095n ± 7% 3.005n ± 9% ~ (p=0.247 n=10)
MemclrUnaligned/4_64 3.586n ± 1% 3.578n ± 3% ~ (p=1.000 n=10)
MemclrUnaligned/4_256 3.843n ± 5% 3.742n ± 10% ~ (p=0.971 n=10)
MemclrUnaligned/4_4096 26.23n ± 0% 26.23n ± 0% ~ (p=1.000 n=10)
MemclrUnaligned/4_65536 401.1n ± 0% 399.5n ± 0% -0.41% (p=0.000 n=10)
MemclrUnaligned/7_5 2.634n ± 6% 2.644n ± 4% ~ (p=0.896 n=10)
MemclrUnaligned/7_16 3.119n ± 7% 3.044n ± 9% ~ (p=0.529 n=10)
MemclrUnaligned/7_64 3.568n ± 1% 3.585n ± 3% ~ (p=0.499 n=10)
MemclrUnaligned/7_256 3.741n ± 9% 3.629n ± 6% ~ (p=0.853 n=10)
MemclrUnaligned/7_4096 26.23n ± 0% 26.23n ± 0% ~ (p=1.000 n=10) ¹
MemclrUnaligned/7_65536 401.1n ± 0% 399.4n ± 0% -0.42% (p=0.000 n=10)
MemclrUnaligned/0_1M 12.82µ ± 0% 12.60µ ± 0% -1.70% (p=0.000 n=10)
MemclrUnaligned/0_4M 51.28µ ± 0% 50.37µ ± 0% -1.77% (p=0.000 n=10)
MemclrUnaligned/0_8M 102.5µ ± 0% 100.8µ ± 0% -1.75% (p=0.000 n=10)
MemclrUnaligned/0_16M 205.1µ ± 0% 201.7µ ± 0% -1.62% (p=0.000 n=10)
MemclrUnaligned/0_64M 965.2µ ± 0% 934.7µ ± 0% -3.16% (p=0.000 n=10)
MemclrUnaligned/1_1M 16.02µ ± 0% 15.81µ ± 0% -1.34% (p=0.000 n=10)
MemclrUnaligned/1_4M 64.03µ ± 0% 63.20µ ± 0% -1.29% (p=0.000 n=10)
MemclrUnaligned/1_8M 128.0µ ± 0% 126.4µ ± 0% -1.27% (p=0.000 n=10)
MemclrUnaligned/1_16M 256.3µ ± 0% 253.2µ ± 0% -1.21% (p=0.000 n=10)
MemclrUnaligned/1_64M 1.210m ± 0% 1.187m ± 0% -1.88% (p=0.000 n=10)
MemclrUnaligned/4_1M 16.03µ ± 0% 15.81µ ± 0% -1.37% (p=0.000 n=10)
MemclrUnaligned/4_4M 64.04µ ± 0% 63.20µ ± 0% -1.31% (p=0.000 n=10)
MemclrUnaligned/4_8M 128.0µ ± 0% 126.4µ ± 0% -1.27% (p=0.000 n=10)
MemclrUnaligned/4_16M 256.1µ ± 0% 253.0µ ± 0% -1.20% (p=0.000 n=10)
MemclrUnaligned/4_64M 1.210m ± 0% 1.188m ± 0% -1.81% (p=0.000 n=10)
MemclrUnaligned/7_1M 16.02µ ± 0% 15.81µ ± 0% -1.32% (p=0.000 n=10)
MemclrUnaligned/7_4M 64.06µ ± 0% 63.21µ ± 0% -1.34% (p=0.000 n=10)
MemclrUnaligned/7_8M 128.1µ ± 0% 126.4µ ± 0% -1.29% (p=0.000 n=10)
MemclrUnaligned/7_16M 256.2µ ± 0% 253.2µ ± 0% -1.18% (p=0.000 n=10)
MemclrUnaligned/7_64M 1.210m ± 0% 1.188m ± 0% -1.82% (p=0.000 n=10)
MemclrRange/1K_2K 841.1n ± 1% 879.0n ± 3% +4.51% (p=0.002 n=10)
MemclrRange/2K_8K 1.435µ ± 2% 1.415µ ± 0% -1.39% (p=0.000 n=10)
MemclrRange/4K_16K 1.241µ ± 0% 1.209µ ± 0% -2.58% (p=0.000 n=10)
MemclrRange/160K_228K 19.83µ ± 0% 19.59µ ± 0% -1.22% (p=0.000 n=10)
MemclrKnownSize1 1.732n ± 0% 1.732n ± 0% ~ (p=0.474 n=10)
MemclrKnownSize2 1.925n ± 3% 1.925n ± 1% ~ (p=0.929 n=10)
MemclrKnownSize4 1.732n ± 0% 1.732n ± 0% ~ (p=1.000 n=10) ¹
MemclrKnownSize8 1.732n ± 0% 1.732n ± 0% ~ (p=1.000 n=10)
MemclrKnownSize16 2.413n ± 9% 2.681n ± 14% +11.10% (p=0.004 n=10)
MemclrKnownSize32 3.284n ± 4% 3.328n ± 2% ~ (p=0.671 n=10)
MemclrKnownSize64 4.893n ± 1% 4.882n ± 1% ~ (p=0.591 n=10)
MemclrKnownSize112 5.623n ± 2% 5.596n ± 2% -0.48% (p=0.027 n=10)
MemclrKnownSize128 5.612n ± 1% 5.599n ± 0% ~ (p=0.066 n=10)
MemclrKnownSize192 7.128n ± 1% 7.337n ± 2% +2.93% (p=0.000 n=10)
MemclrKnownSize248 6.740n ± 1% 6.829n ± 3% +1.33% (p=0.005 n=10)
MemclrKnownSize256 3.657n ± 8% 3.512n ± 14% ~ (p=0.436 n=10)
MemclrKnownSize512 3.624n ± 3% 3.982n ± 9% +9.88% (p=0.017 n=10)
MemclrKnownSize1024 4.662n ± 0% 4.680n ± 0% +0.39% (p=0.000 n=10)
MemclrKnownSize4096 15.14n ± 0% 15.15n ± 0% +0.07% (p=0.000 n=10)
MemclrKnownSize512KiB 6.388µ ± 0% 6.309µ ± 0% -1.24% (p=0.000 n=10)
geomean 268.9n 266.9n -0.75%
¹ all samples are equal
Change-Id: I2911866fb82777311ec4219600fb48c85f7bf862
Reviewed-on: https://go-review.googlesource.com/c/go/+/682595
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
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