mirror of https://github.com/golang/go.git
c3dadb3d19
Previously, the 6g and 8g registerizers scanned for used registers beyond the end of a region being considered for registerization. This ancient artifact was copied from the C compilers, where it was probably necessary to track implicitly used registers. In the Go compilers it's harmless (because it can only over-restrict the set of available registers), but no longer necessary because the Go compilers correctly track register use/set information. The consequences of this extra scan were (at least) that 1) we would not consider allocating the AX register if there was a deferproc call in the future because deferproc uses AX as a return register, so we see the use of AX, but don't track that AX is set by the CALL, and 2) we could not consider allocating the DX register if there was a MUL in the future because MUL implicitly sets DX and (thanks to an abuse of copyu in this code) we would also consider DX used. This commit fixes these problems by nuking this code. LGTM=rsc R=rsc CC=golang-codereviews https://golang.org/cl/174110043 |
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| LICENSE | ||
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| README | ||
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README
This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install-source.html
in your web browser.
After installing Go, you can view a nicely formatted
doc/install-source.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install/source.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.