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Use uint index variables in some cases instead of int to enable strength reduction; this makes it possible for the compiler to reduce % into masks. Old code: 6g -S md4.go md4block.go | grep "md4block.go:44" 0471 (md4block.go:44) MOVL AX,BX 0472 (md4block.go:44) MOVL AX,BP 0473 (md4block.go:44) MOVL AX,R8 0474 (md4block.go:44) SARL $31,R8 0475 (md4block.go:44) SHRL $30,R8 0476 (md4block.go:44) ADDL R8,BP 0477 (md4block.go:44) SARL $2,BP 0478 (md4block.go:44) IMULL $4,BP 0479 (md4block.go:44) SUBL BP,BX 0480 (md4block.go:44) MOVLQSX BX,BX 0481 (md4block.go:44) LEAQ shift1+0(SB),BP 0482 (md4block.go:44) CMPL BX,8(BP) 0483 (md4block.go:44) JCS ,485 0484 (md4block.go:44) CALL ,runtime.throwindex+0(SB) 0485 (md4block.go:44) MOVQ (BP),BP 0486 (md4block.go:44) MOVL (BP)(BX*4),DI New code: 6g -S md4.go md4block.go | grep "md4block.go:44" 0471 (md4block.go:44) MOVL AX,BX 0472 (md4block.go:44) ANDL $3,BX 0473 (md4block.go:44) MOVLQZX BX,BX 0474 (md4block.go:44) LEAQ shift1+0(SB),BP 0475 (md4block.go:44) CMPL BX,8(BP) 0476 (md4block.go:44) JCS ,478 0477 (md4block.go:44) CALL ,runtime.throwindex+0(SB) 0478 (md4block.go:44) MOVQ (BP),BP 0479 (md4block.go:44) MOVL (BP)(BX*4),DI R=agl, agl1 CC=golang-dev https://golang.org/cl/181086 |
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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.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.