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Meng Zhuo 05f9511582 cmd/compile: improve FP FMA performance on riscv64
FMADD/FMSUB/FNSUB are an efficient FP FMA instructions, which can
be used by the compiler to improve FP performance.

Erf               188.0n ± 2%   139.5n ± 2%  -25.82% (p=0.000 n=10)
Erfc              193.6n ± 1%   143.2n ± 1%  -26.01% (p=0.000 n=10)
Erfinv            244.4n ± 2%   172.6n ± 0%  -29.40% (p=0.000 n=10)
Erfcinv           244.7n ± 2%   173.0n ± 1%  -29.31% (p=0.000 n=10)
geomean           216.0n        156.3n       -27.65%

Ref: The RISC-V Instruction Set Manual Volume I: Unprivileged ISA
11.6 Single-Precision Floating-Point Computational Instructions

Change-Id: I89aa3a4df7576fdd47f4a6ee608ac16feafd093c
Reviewed-on: https://go-review.googlesource.com/c/go/+/506036
Reviewed-by: Joel Sing <joel@sing.id.au>
Run-TryBot: M Zhuo <mzh@golangcn.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2023-08-22 08:38:08 +00:00
.github .github: fix templates with multiple labels 2023-07-31 18:28:27 +00:00
api encoding: add AppendEncode and AppendDecode 2023-08-17 16:23:42 +00:00
doc spec: clarify that []byte("") must be non-nil 2023-08-21 23:20:08 +00:00
lib/time lib/time: update to 2023c/2023c 2023-05-03 20:14:11 +00:00
misc os: add tests for UserCacheDir and UserConfigDir 2023-08-21 17:46:57 +00:00
src cmd/compile: improve FP FMA performance on riscv64 2023-08-22 08:38:08 +00:00
test cmd/compile: improve FP FMA performance on riscv64 2023-08-22 08:38:08 +00:00
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.gitignore internal/platform,cmd/dist: export the list of supported platforms 2023-06-22 19:44:52 +00:00
codereview.cfg
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00
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