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big/arith: assembly routines for 386 long shifts (2nd round)

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R=rsc
CC=golang-dev
https://golang.org/cl/986044
This commit is contained in:
Robert Griesemer 2010-04-30 14:41:04 -07:00
parent c66b49845c
commit 161b44c76a
1 changed files with 16 additions and 19 deletions
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35
src/pkg/big/arith_386.s
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@ -101,24 +101,24 @@ E4: CMPL BX, BP // i < n
// func shlVW(z, x *Word, s Word, n int) (c Word)
TEXT ·shlVW(SB),7,$0
NOP
JMP ·shlVW_g(SB) // TODO(gri) remove once code below works
MOVL z+0(FP), DI
MOVL x+4(FP), SI
MOVL s+8(FP), CX
MOVL n+12(FP), BP
MOVL n+12(FP), BX
LEAL (DI)(BX*4), DI
LEAL (SI)(BX*4), SI
NEGL BX // i = -n
MOVL $0, AX // c = 0
MOVL $0, BX // i = 0
JMP E8
L8: MOVL (SI)(BX*8), DX
L8: MOVL (SI)(BX*4), DX
MOVL DX, BP
SHLL CX, DX:AX
MOVL DX, (DI)(BX*8)
MOVL (SI)(BX*8), AX // reload (not enough regs to save original DX)
MOVL DX, (DI)(BX*4)
MOVL BP, AX
ADDL $1, BX // i++
E8: CMPL BX, BP // i < n
E8: CMPL BX, $0 // i < 0
JL L8
MOVL $0, DX
@ -129,9 +129,6 @@ E8: CMPL BX, BP // i < n
// func shrVW(z, x *Word, s Word, n int) (c Word)
TEXT ·shrVW(SB),7,$0
NOP
JMP ·shrVW_g(SB) // TODO(gri) remove once code below works
MOVL z+0(FP), DI
MOVL x+4(FP), SI
MOVL s+8(FP), CX
@ -139,10 +136,10 @@ TEXT ·shrVW(SB),7,$0
MOVL $0, AX // c = 0
JMP E9
L9: MOVL (SI)(BX*8), DX
L9: MOVL (SI)(BX*4), DX
MOVL DX, BP
SHRL CX, DX:AX
MOVL DX, (DI)(BX*8)
MOVL DX, (DI)(BX*4)
MOVL BP, AX
E9: SUBL $1, BX // i--
@ -161,9 +158,9 @@ TEXT ·mulAddVWW(SB),7,$0
MOVL y+8(FP), BP
MOVL r+12(FP), CX // c = r
MOVL n+16(FP), BX
LEAL (SI)(BX*4), SI
LEAL (DI)(BX*4), DI
NEGL BX // i = -n
LEAL (DI)(BX*4), DI
LEAL (SI)(BX*4), SI
NEGL BX // i = -n
JMP E5
L5: MOVL (SI)(BX*4), AX
@ -187,8 +184,8 @@ TEXT ·addMulVVW(SB),7,$0
MOVL x+4(FP), SI
MOVL y+8(FP), BP
MOVL n+12(FP), BX
LEAL (SI)(BX*4), SI
LEAL (DI)(BX*4), DI
LEAL (DI)(BX*4), DI
LEAL (SI)(BX*4), SI
NEGL BX // i = -n
MOVL $0, CX // c = 0
JMP E6