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https://github.com/octoleo/syncthing.git
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267 lines
4.5 KiB
ArmAsm
267 lines
4.5 KiB
ArmAsm
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file provides fast assembly versions for the elementary
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// arithmetic operations on vectors implemented in arith.go.
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// func mulWW(x, y Word) (z1, z0 Word)
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TEXT ·mulWW(SB),7,$0
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MOVL x+0(FP), AX
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MULL y+4(FP)
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MOVL DX, z1+8(FP)
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MOVL AX, z0+12(FP)
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RET
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// func divWW(x1, x0, y Word) (q, r Word)
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TEXT ·divWW(SB),7,$0
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MOVL x1+0(FP), DX
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MOVL x0+4(FP), AX
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DIVL y+8(FP)
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MOVL AX, q+12(FP)
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MOVL DX, r+16(FP)
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RET
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// func addVV(z, x, y []Word) (c Word)
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TEXT ·addVV(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), CX
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MOVL n+4(FP), BP
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MOVL $0, BX // i = 0
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MOVL $0, DX // c = 0
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JMP E1
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L1: MOVL (SI)(BX*4), AX
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RCRL $1, DX
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ADCL (CX)(BX*4), AX
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RCLL $1, DX
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MOVL AX, (DI)(BX*4)
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ADDL $1, BX // i++
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E1: CMPL BX, BP // i < n
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JL L1
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MOVL DX, c+36(FP)
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RET
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// func subVV(z, x, y []Word) (c Word)
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// (same as addVV except for SBBL instead of ADCL and label names)
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TEXT ·subVV(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), CX
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MOVL n+4(FP), BP
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MOVL $0, BX // i = 0
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MOVL $0, DX // c = 0
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JMP E2
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L2: MOVL (SI)(BX*4), AX
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RCRL $1, DX
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SBBL (CX)(BX*4), AX
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RCLL $1, DX
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MOVL AX, (DI)(BX*4)
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ADDL $1, BX // i++
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E2: CMPL BX, BP // i < n
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JL L2
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MOVL DX, c+36(FP)
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RET
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// func addVW(z, x []Word, y Word) (c Word)
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TEXT ·addVW(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), AX // c = y
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MOVL n+4(FP), BP
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MOVL $0, BX // i = 0
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JMP E3
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L3: ADDL (SI)(BX*4), AX
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MOVL AX, (DI)(BX*4)
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RCLL $1, AX
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ANDL $1, AX
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ADDL $1, BX // i++
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E3: CMPL BX, BP // i < n
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JL L3
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MOVL AX, c+28(FP)
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RET
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// func subVW(z, x []Word, y Word) (c Word)
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TEXT ·subVW(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), AX // c = y
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MOVL n+4(FP), BP
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MOVL $0, BX // i = 0
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JMP E4
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L4: MOVL (SI)(BX*4), DX // TODO(gri) is there a reverse SUBL?
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SUBL AX, DX
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MOVL DX, (DI)(BX*4)
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RCLL $1, AX
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ANDL $1, AX
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ADDL $1, BX // i++
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E4: CMPL BX, BP // i < n
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JL L4
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MOVL AX, c+28(FP)
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RET
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// func shlVU(z, x []Word, s uint) (c Word)
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TEXT ·shlVU(SB),7,$0
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MOVL n+4(FP), BX // i = n
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SUBL $1, BX // i--
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JL X8b // i < 0 (n <= 0)
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// n > 0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL s+24(FP), CX
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MOVL (SI)(BX*4), AX // w1 = x[n-1]
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MOVL $0, DX
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SHLL CX, DX:AX // w1>>ŝ
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MOVL DX, c+28(FP)
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CMPL BX, $0
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JLE X8a // i <= 0
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// i > 0
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L8: MOVL AX, DX // w = w1
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MOVL -4(SI)(BX*4), AX // w1 = x[i-1]
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SHLL CX, DX:AX // w<<s | w1>>ŝ
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MOVL DX, (DI)(BX*4) // z[i] = w<<s | w1>>ŝ
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SUBL $1, BX // i--
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JG L8 // i > 0
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// i <= 0
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X8a: SHLL CX, AX // w1<<s
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MOVL AX, (DI) // z[0] = w1<<s
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RET
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X8b: MOVL $0, c+28(FP)
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RET
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// func shrVU(z, x []Word, s uint) (c Word)
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TEXT ·shrVU(SB),7,$0
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MOVL n+4(FP), BP
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SUBL $1, BP // n--
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JL X9b // n < 0 (n <= 0)
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// n > 0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL s+24(FP), CX
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MOVL (SI), AX // w1 = x[0]
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MOVL $0, DX
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SHRL CX, DX:AX // w1<<ŝ
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MOVL DX, c+28(FP)
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MOVL $0, BX // i = 0
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JMP E9
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// i < n-1
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L9: MOVL AX, DX // w = w1
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MOVL 4(SI)(BX*4), AX // w1 = x[i+1]
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SHRL CX, DX:AX // w>>s | w1<<ŝ
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MOVL DX, (DI)(BX*4) // z[i] = w>>s | w1<<ŝ
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ADDL $1, BX // i++
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E9: CMPL BX, BP
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JL L9 // i < n-1
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// i >= n-1
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X9a: SHRL CX, AX // w1>>s
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MOVL AX, (DI)(BP*4) // z[n-1] = w1>>s
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RET
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X9b: MOVL $0, c+28(FP)
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RET
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// func mulAddVWW(z, x []Word, y, r Word) (c Word)
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TEXT ·mulAddVWW(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), BP
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MOVL r+28(FP), CX // c = r
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MOVL n+4(FP), BX
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LEAL (DI)(BX*4), DI
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LEAL (SI)(BX*4), SI
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NEGL BX // i = -n
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JMP E5
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L5: MOVL (SI)(BX*4), AX
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MULL BP
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ADDL CX, AX
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ADCL $0, DX
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MOVL AX, (DI)(BX*4)
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MOVL DX, CX
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ADDL $1, BX // i++
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E5: CMPL BX, $0 // i < 0
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JL L5
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MOVL CX, c+32(FP)
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RET
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// func addMulVVW(z, x []Word, y Word) (c Word)
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TEXT ·addMulVVW(SB),7,$0
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MOVL z+0(FP), DI
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MOVL x+12(FP), SI
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MOVL y+24(FP), BP
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MOVL n+4(FP), BX
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LEAL (DI)(BX*4), DI
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LEAL (SI)(BX*4), SI
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NEGL BX // i = -n
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MOVL $0, CX // c = 0
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JMP E6
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L6: MOVL (SI)(BX*4), AX
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MULL BP
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ADDL CX, AX
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ADCL $0, DX
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ADDL AX, (DI)(BX*4)
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ADCL $0, DX
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MOVL DX, CX
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ADDL $1, BX // i++
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E6: CMPL BX, $0 // i < 0
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JL L6
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MOVL CX, c+28(FP)
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RET
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// func divWVW(z* Word, xn Word, x []Word, y Word) (r Word)
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TEXT ·divWVW(SB),7,$0
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MOVL z+0(FP), DI
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MOVL xn+12(FP), DX // r = xn
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MOVL x+16(FP), SI
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MOVL y+28(FP), CX
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MOVL n+4(FP), BX // i = n
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JMP E7
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L7: MOVL (SI)(BX*4), AX
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DIVL CX
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MOVL AX, (DI)(BX*4)
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E7: SUBL $1, BX // i--
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JGE L7 // i >= 0
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MOVL DX, r+32(FP)
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RET
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