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5 Commits

Author SHA1 Message Date
Wayne Zuo
66f03f79da cmd/compile: add SHLX&SHRX without load 
Change-Id: I79eb5e7d6bcb23f26d3a100e915efff6dae70391
Reviewed-on: https://go-review.googlesource.com/c/go/+/399061
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
 2022-04-13 17:48:36 +00:00
Wayne Zuo
517781b391 cmd/compile: add SARXQload and SARXLload 
Change-Id: I4e8dc5009a5b8af37d71b62f1322f94806d3e9d9
Reviewed-on: https://go-review.googlesource.com/c/go/+/399056
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
 2022-04-13 17:48:12 +00:00
Wayne Zuo
d6320f1a58 cmd/compile: add SARX instruction for GOAMD64>=3 
name                    old time/op  new time/op  delta
ShiftArithmeticRight-8  0.68ns ± 5%  0.30ns ± 6%  -56.14%  (p=0.000 n=10+10)

Change-Id: I052a0d7b9e6526d526276444e588b0cc288beff4
Reviewed-on: https://go-review.googlesource.com/c/go/+/399055
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
 2022-04-12 12:59:27 +00:00
Wayne Zuo
7fbabe8d57 cmd/compile: use shlx&shrx instruction for GOAMD64>=v3 
The SHRX/SHLX instruction can take any general register as the shift count operand, and can read source from memory. This CL introduces some operators to combine load and shift to one instruction.

For #47120

Change-Id: I13b48f53c7d30067a72eb2c8382242045dead36a
Reviewed-on: https://go-review.googlesource.com/c/go/+/385174
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Cherry Mui <cherryyz@google.com>
 2022-04-04 20:07:23 +00:00
Matthew Dempsky
04572fa29b cmd/compile: use BMI1 instructions for GOAMD64=v3 and higher 
BMI1 includes four instructions (ANDN, BLSI, BLSMSK, BLSR) that are
easy to peephole optimize, and which GCC always seems to favor using
when available and applicable.

Updates #45453.

Change-Id: I0274184057058f5c579e5bc3ea9c414396d3cf46
Reviewed-on: https://go-review.googlesource.com/c/go/+/351130
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Trust: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
 2021-09-22 00:15:27 +00:00