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math: add round assembly implementations on riscv64 

goos: linux
goarch: riscv64
pkg: math
            │ floor_old.bench │           floor_new.bench           │
            │     sec/op      │   sec/op     vs base                │
Ceil              54.12n ± 0%   22.05n ± 0%  -59.26% (p=0.000 n=10)
Floor             40.80n ± 0%   22.05n ± 0%  -45.96% (p=0.000 n=10)
Round             20.73n ± 0%   20.74n ± 0%        ~ (p=0.441 n=10)
RoundToEven       24.07n ± 0%   24.07n ± 0%        ~ (p=1.000 n=10)
Trunc             38.73n ± 0%   22.05n ± 0%  -43.07% (p=0.000 n=10)
geomean           33.58n        22.17n       -33.98%

Change-Id: I24fb9e3bbf8146da253b6791b21377bea1afbd16
Reviewed-on: https://go-review.googlesource.com/c/go/+/504737
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: M Zhuo <mengzhuo1203@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: M Zhuo <mengzhuo1203@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
This commit is contained in:
Meng Zhuo 2023-06-20 20:43:11 +08:00 committed by M Zhuo
parent 27e104ba09
commit ad377e906a
3 changed files with 43 additions and 2 deletions
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2
src/math/floor_asm.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style // Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file. // license that can be found in the LICENSE file.
//go:build 386 || amd64 || arm64 || ppc64 || ppc64le || s390x || wasm //go:build 386 || amd64 || arm64 || ppc64 || ppc64le || riscv64 || s390x || wasm
package math package math

2
src/math/floor_noasm.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style // Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file. // license that can be found in the LICENSE file.
//go:build !386 && !amd64 && !arm64 && !ppc64 && !ppc64le && !s390x && !wasm //go:build !386 && !amd64 && !arm64 && !ppc64 && !ppc64le && !riscv64 && !s390x && !wasm
package math package math

41
src/math/floor_riscv64.s Normal file
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@ -0,0 +1,41 @@
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
#define PosInf 0x7FF0000000000000
// The rounding mode of RISC-V is different from Go spec.
#define ROUNDFN(NAME, MODE) \
TEXT NAME(SB),NOSPLIT,$0; \
MOVD x+0(FP), F0; \
/* whether x is NaN */; \
FEQD F0, F0, X6; \
BNEZ X6, 3(PC); \
/* return NaN if x is NaN */; \
MOVD F0, ret+8(FP); \
RET; \
MOV $PosInf, X6; \
FMVDX X6, F1; \
FABSD F0, F2; \
/* if abs(x) > +Inf, return Inf instead of round(x) */; \
FLTD F1, F2, X6; \
/* Inf should keep same signed with x then return */; \
BEQZ X6, 3(PC); \
FCVTLD.MODE F0, X6; \
FCVTDL X6, F1; \
/* rounding will drop signed bit in RISCV, restore it */; \
FSGNJD F0, F1, F0; \
MOVD F0, ret+8(FP); \
RET
// func archFloor(x float64) float64
ROUNDFN(·archFloor, RDN)
// func archCeil(x float64) float64
ROUNDFN(·archCeil, RUP)
// func archTrunc(x float64) float64
ROUNDFN(·archTrunc, RTZ)