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The Go programming language
0184081eb9
Given the following Go program:
func sum(s []int) int {
ret := 0
for _, x := range s {
ret += x
}
return ret
}
6g would previously generate:
--- prog list "sum" ---
0000 (main.go:3) TEXT sum+0(SB),$0-24
0001 (main.go:5) MOVQ s+0(FP),CX
0002 (main.go:5) MOVL s+8(FP),DI
0003 (main.go:5) MOVL s+12(FP),BX
0004 (main.go:4) MOVL $0,SI
0005 (main.go:5) MOVL $0,AX
0006 (main.go:5) JMP ,8
0007 (main.go:5) INCL ,AX
0008 (main.go:5) CMPL AX,DI
0009 (main.go:5) JGE $0,16
0010 (main.go:5) MOVL (CX),DX
0011 (main.go:5) MOVQ $4,BX
0012 (main.go:5) ADDQ CX,BX
0013 (main.go:5) MOVQ BX,CX
0014 (main.go:6) ADDL DX,SI
0015 (main.go:5) JMP ,7
0016 (main.go:8) MOVL SI,.noname+16(FP)
0017 (main.go:8) RET ,
and now generates:
--- prog list "sum" ---
0000 (main.go:3) TEXT sum+0(SB),$0-24
0001 (main.go:5) MOVQ s+0(FP),CX
0002 (main.go:5) MOVL s+8(FP),DI
0003 (main.go:5) MOVL s+12(FP),BX
0004 (main.go:4) MOVL $0,SI
0005 (main.go:5) MOVL $0,AX
0006 (main.go:5) JMP ,8
0007 (main.go:5) INCL ,AX
0008 (main.go:5) CMPL AX,DI
0009 (main.go:5) JGE $0,14
0010 (main.go:5) MOVL (CX),BP
0011 (main.go:5) ADDQ $4,CX
0012 (main.go:6) ADDL BP,SI
0013 (main.go:5) JMP ,7
0014 (main.go:8) MOVL SI,.noname+16(FP)
0015 (main.go:8) RET ,
The key difference is that
0011 (main.go:5) MOVQ $4,BX
0012 (main.go:5) ADDQ CX,BX
0013 (main.go:5) MOVQ BX,CX
has changed to
0011 (main.go:5) ADDQ $4,CX
R=rsc, dave, remyoudompheng
CC=golang-dev
https://golang.org/cl/6506089
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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.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
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.