• Robert Griesemer's avatar
    Symmetric changes to md4.go as for md5.go. · f0fcb2d5
    Robert Griesemer authored
    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
    f0fcb2d5
md4block.go 1.99 KB