From 8916773a3d6faabed5d500f8bf0d89b7048aecde Mon Sep 17 00:00:00 2001 From: Meng Zhuo Date: Tue, 6 Mar 2018 02:47:09 +0000 Subject: runtime, cmd/compile: use ldp for DUFFCOPY on ARM64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit name old time/op new time/op delta CopyFat8 2.15ns ± 1% 2.19ns ± 6% ~ (p=0.171 n=8+9) CopyFat12 2.15ns ± 0% 2.17ns ± 2% ~ (p=0.137 n=8+10) CopyFat16 2.17ns ± 3% 2.15ns ± 0% ~ (p=0.211 n=10+10) CopyFat24 2.16ns ± 1% 2.15ns ± 0% ~ (p=0.087 n=10+10) CopyFat32 11.5ns ± 0% 12.8ns ± 2% +10.87% (p=0.000 n=8+10) CopyFat64 20.2ns ± 2% 12.9ns ± 0% -36.11% (p=0.000 n=10+10) CopyFat128 37.2ns ± 0% 21.5ns ± 0% -42.20% (p=0.000 n=10+10) CopyFat256 71.6ns ± 0% 38.7ns ± 0% -45.95% (p=0.000 n=10+10) CopyFat512 140ns ± 0% 73ns ± 0% -47.86% (p=0.000 n=10+9) CopyFat520 142ns ± 0% 74ns ± 0% -47.54% (p=0.000 n=10+10) CopyFat1024 277ns ± 0% 141ns ± 0% -49.10% (p=0.000 n=10+10) Change-Id: If54bc571add5db674d5e081579c87e80153d0a5a Reviewed-on: https://go-review.googlesource.com/97395 Reviewed-by: Cherry Zhang --- src/runtime/mkduff.go | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'src/runtime/mkduff.go') diff --git a/src/runtime/mkduff.go b/src/runtime/mkduff.go index fcc7f83197..b7c7e2689c 100644 --- a/src/runtime/mkduff.go +++ b/src/runtime/mkduff.go @@ -164,12 +164,13 @@ func zeroARM64(w io.Writer) { func copyARM64(w io.Writer) { // R16 (aka REGRT1): ptr to source memory // R17 (aka REGRT2): ptr to destination memory - // R27 (aka REGTMP): scratch space + // R26, R27 (aka REGTMP): scratch space // R16 and R17 are updated as a side effect - fmt.Fprintln(w, "TEXT runtime·duffcopy(SB), NOSPLIT, $0-0") - for i := 0; i < 128; i++ { - fmt.Fprintln(w, "\tMOVD.P\t8(R16), R27") - fmt.Fprintln(w, "\tMOVD.P\tR27, 8(R17)") + fmt.Fprintln(w, "TEXT runtime·duffcopy(SB), NOSPLIT|NOFRAME, $0-0") + + for i := 0; i < 64; i++ { + fmt.Fprintln(w, "\tLDP.P\t16(R16), (R26, R27)") + fmt.Fprintln(w, "\tSTP.P\t(R26, R27), 16(R17)") fmt.Fprintln(w) } fmt.Fprintln(w, "\tRET") -- cgit v1.3