7d9f1067d1
Reorder how register & stack allocation is done. We used to allocate registers, then fix up merge edges, then allocate stack slots. This lead to lots of unnecessary copies on merge edges: v2 = LoadReg v1 v3 = StoreReg v2 If v1 and v3 are allocated to the same stack slot, then this code is unnecessary. But at regalloc time we didn't know the homes of v1 and v3. To fix this problem, allocate all the stack slots before fixing up the merge edges. That way, we know what stack slots values use so we know what copies are required. Use a good technique for shuffling values around on merge edges. Improves performance of the go1 TimeParse benchmark by ~12% Change-Id: I731f43e4ff1a7e0dc4cd4aa428fcdb97812b86fa Reviewed-on: https://go-review.googlesource.com/17915 Reviewed-by: David Chase <drchase@google.com> |
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README.md
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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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 file). 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-source.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 https://golang.org/doc/install or doc/install.html for more details.