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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file provides fast assembly versions for the elementary
// arithmetic operations on vectors implemented in arith.go.
// TODO(gri) - experiment with unrolled loops for faster execution
// func mulWW(x, y Word) (z1, z0 Word)
TEXT ·mulWW(SB),7,$0
MOVQ x+0(FP), AX
MULQ y+8(FP)
MOVQ DX, z1+16(FP)
MOVQ AX, z0+24(FP)
RET
// func divWW(x1, x0, y Word) (q, r Word)
TEXT ·divWW(SB),7,$0
MOVQ x1+0(FP), DX
MOVQ x0+8(FP), AX
DIVQ y+16(FP)
MOVQ AX, q+24(FP)
MOVQ DX, r+32(FP)
RET
// func addVV(z, x, y []Word) (c Word)
TEXT ·addVV(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), R9
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
MOVQ $0, DX // c = 0
JMP E1
L1: MOVQ (R8)(BX*8), AX
RCRQ $1, DX
ADCQ (R9)(BX*8), AX
RCLQ $1, DX
MOVQ AX, (R10)(BX*8)
ADDL $1, BX // i++
E1: CMPQ BX, R11 // i < n
JL L1
MOVQ DX, c+48(FP)
RET
// func subVV(z, x, y []Word) (c Word)
// (same as addVV_s except for SBBQ instead of ADCQ and label names)
TEXT ·subVV(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), R9
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
MOVQ $0, DX // c = 0
JMP E2
L2: MOVQ (R8)(BX*8), AX
RCRQ $1, DX
SBBQ (R9)(BX*8), AX
RCLQ $1, DX
MOVQ AX, (R10)(BX*8)
ADDL $1, BX // i++
E2: CMPQ BX, R11 // i < n
JL L2
MOVQ DX, c+48(FP)
RET
// func addVW(z, x []Word, y Word) (c Word)
TEXT ·addVW(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), AX // c = y
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
JMP E3
L3: ADDQ (R8)(BX*8), AX
MOVQ AX, (R10)(BX*8)
RCLQ $1, AX
ANDQ $1, AX
ADDL $1, BX // i++
E3: CMPQ BX, R11 // i < n
JL L3
MOVQ AX, c+40(FP)
RET
// func subVW(z, x []Word, y Word) (c Word)
TEXT ·subVW(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), AX // c = y
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
JMP E4
L4: MOVQ (R8)(BX*8), DX // TODO(gri) is there a reverse SUBQ?
SUBQ AX, DX
MOVQ DX, (R10)(BX*8)
RCLQ $1, AX
ANDQ $1, AX
ADDL $1, BX // i++
E4: CMPQ BX, R11 // i < n
JL L4
MOVQ AX, c+40(FP)
RET
// func shlVU(z, x []Word, s uint) (c Word)
TEXT ·shlVU(SB),7,$0
MOVL n+8(FP), BX // i = n
SUBL $1, BX // i--
JL X8b // i < 0 (n <= 0)
// n > 0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVL s+32(FP), CX
MOVQ (R8)(BX*8), AX // w1 = x[n-1]
MOVQ $0, DX
SHLQ CX, DX:AX // w1>>ŝ
MOVQ DX, c+40(FP)
CMPL BX, $0
JLE X8a // i <= 0
// i > 0
L8: MOVQ AX, DX // w = w1
MOVQ -8(R8)(BX*8), AX // w1 = x[i-1]
SHLQ CX, DX:AX // w<<s | w1>>ŝ
MOVQ DX, (R10)(BX*8) // z[i] = w<<s | w1>>ŝ
SUBL $1, BX // i--
JG L8 // i > 0
// i <= 0
X8a: SHLQ CX, AX // w1<<s
MOVQ AX, (R10) // z[0] = w1<<s
RET
X8b: MOVQ $0, c+40(FP)
RET
// func shrVU(z, x []Word, s uint) (c Word)
TEXT ·shrVU(SB),7,$0
MOVL n+8(FP), R11
SUBL $1, R11 // n--
JL X9b // n < 0 (n <= 0)
// n > 0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVL s+32(FP), CX
MOVQ (R8), AX // w1 = x[0]
MOVQ $0, DX
SHRQ CX, DX:AX // w1<<ŝ
MOVQ DX, c+40(FP)
MOVQ $0, BX // i = 0
JMP E9
// i < n-1
L9: MOVQ AX, DX // w = w1
MOVQ 8(R8)(BX*8), AX // w1 = x[i+1]
SHRQ CX, DX:AX // w>>s | w1<<ŝ
MOVQ DX, (R10)(BX*8) // z[i] = w>>s | w1<<ŝ
ADDL $1, BX // i++
E9: CMPQ BX, R11
JL L9 // i < n-1
// i >= n-1
X9a: SHRQ CX, AX // w1>>s
MOVQ AX, (R10)(R11*8) // z[n-1] = w1>>s
RET
X9b: MOVQ $0, c+40(FP)
RET
// func mulAddVWW(z, x []Word, y, r Word) (c Word)
TEXT ·mulAddVWW(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), R9
MOVQ r+40(FP), CX // c = r
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
JMP E5
L5: MOVQ (R8)(BX*8), AX
MULQ R9
ADDQ CX, AX
ADCQ $0, DX
MOVQ AX, (R10)(BX*8)
MOVQ DX, CX
ADDL $1, BX // i++
E5: CMPQ BX, R11 // i < n
JL L5
MOVQ CX, c+48(FP)
RET
// func addMulVVW(z, x []Word, y Word) (c Word)
TEXT ·addMulVVW(SB),7,$0
MOVQ z+0(FP), R10
MOVQ x+16(FP), R8
MOVQ y+32(FP), R9
MOVL n+8(FP), R11
MOVQ $0, BX // i = 0
MOVQ $0, CX // c = 0
JMP E6
L6: MOVQ (R8)(BX*8), AX
MULQ R9
ADDQ CX, AX
ADCQ $0, DX
ADDQ AX, (R10)(BX*8)
ADCQ $0, DX
MOVQ DX, CX
ADDL $1, BX // i++
E6: CMPQ BX, R11 // i < n
JL L6
MOVQ CX, c+40(FP)
RET
// func divWVW(z []Word, xn Word, x []Word, y Word) (r Word)
TEXT ·divWVW(SB),7,$0
MOVQ z+0(FP), R10
MOVQ xn+16(FP), DX // r = xn
MOVQ x+24(FP), R8
MOVQ y+40(FP), R9
MOVL n+8(FP), BX // i = n
JMP E7
L7: MOVQ (R8)(BX*8), AX
DIVQ R9
MOVQ AX, (R10)(BX*8)
E7: SUBL $1, BX // i--
JGE L7 // i >= 0
MOVQ DX, r+48(FP)
RET
// func bitLen(x Word) (n int)
TEXT ·bitLen(SB),7,$0
BSRQ x+0(FP), AX
JZ Z1
INCL AX
MOVL AX, n+8(FP)
RET
Z1: MOVL $0, n+8(FP)
RET
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