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The Go programming language
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Martin Möhrmann 144e0b1f6e cmd/compile: add MOVOstoreconst with offset folding on amd64 
Replace MOVOstorezero with new MOVOstoreconst.
MOVOstoreconst has similar address folding rules then
other MOVstoreconst operations but only supports zero
as store value. Currently only MOVO stores with zero
values are generated. Using MOVOstoreconst with
SymValAndOff aux has the advantage that we can just
add one more MOVstoreconst variant to the existing rules.

The main effect of this CL is converting 16 byte zeroing
of a value on the stack from LEAQ+MOVUPS to just MOVUPS
which reduces binary size.

old:
LEAQ 0x20(SP), DX
MOVUPS X15, 0(DX)

new:
MOVUPS X15, 0x20(SP)

file      before    after     Δ       %
addr2line 3661568   3657472   -4096   -0.112%
asm       4566432   4562336   -4096   -0.090%
cgo       4305456   4301360   -4096   -0.095%
compile   22878528  22874512  -4016   -0.018%
cover     4517952   4513856   -4096   -0.091%
link      6287248   6283152   -4096   -0.065%
nm        3640768   3636672   -4096   -0.113%
objdump   4010592   4006496   -4096   -0.102%
pack      2188224   2184128   -4096   -0.187%
pprof     13429504  13421312  -8192   -0.061%
trace     10143968  10135776  -8192   -0.081%
vet       6868864   6864768   -4096   -0.060%

Change-Id: I08f5dd5ab9251448a4572d3ddd1e0c8cd417f5e3
Reviewed-on: https://go-review.googlesource.com/c/go/+/346249
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Trust: Martin Möhrmann <martin@golang.org>
2021-08-31 17:35:15 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api net: reduce allocations for UDP send/recv on Windows 2021-08-16 23:57:10 +00:00
doc spec: add example for method value in case of embedded method 2021-08-23 17:29:25 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc cmd/cgo: fix unused parameter warnings in generated _cgo_main.c 2021-08-16 23:03:03 +00:00
src cmd/compile: add MOVOstoreconst with offset folding on amd64 2021-08-31 17:35:15 +00:00
test cmd/compile: builtins may be in the unsafe package 2021-08-31 17:21:38 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: update name 2021-06-01 17:08:12 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: update for the Go 1.17 release 2021-08-12 17:43:16 +00:00
LICENSE
PATENTS
README.md README: pull gopher image from website 2021-02-16 18:25:10 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

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Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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To contribute, please read the contribution guidelines at https://golang.org/doc/contribute.html.

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.