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Copy patharith_arm64.s
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167 lines (142 loc) · 3.17 KB
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// Copyright 2013 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.
// +build !math_big_pure_go
#include "textflag.h"
// This file provides fast assembly versions for the elementary
// arithmetic operations on vectors implemented in arith.go.
// TODO: Consider re-implementing using Advanced SIMD
// once the assembler supports those instructions.
// func mulWW(x, y Word) (z1, z0 Word)
TEXT ·mulWW(SB),NOSPLIT,$0
MOVD x+0(FP), R0
MOVD y+8(FP), R1
MUL R0, R1, R2
UMULH R0, R1, R3
MOVD R3, z1+16(FP)
MOVD R2, z0+24(FP)
RET
// func divWW(x1, x0, y Word) (q, r Word)
TEXT ·divWW(SB),NOSPLIT,$0
B ·divWW_g(SB) // ARM64 has no multiword division
// func addVV(z, x, y []Word) (c Word)
TEXT ·addVV(SB),NOSPLIT,$0
MOVD z+0(FP), R3
MOVD z_len+8(FP), R0
MOVD x+24(FP), R1
MOVD y+48(FP), R2
ADDS $0, R0 // clear carry flag
loop:
CBZ R0, done // careful not to touch the carry flag
MOVD.P 8(R1), R4
MOVD.P 8(R2), R5
ADCS R4, R5
MOVD.P R5, 8(R3)
SUB $1, R0
B loop
done:
CSET HS, R0 // extract carry flag
MOVD R0, c+72(FP)
RET
// func subVV(z, x, y []Word) (c Word)
TEXT ·subVV(SB),NOSPLIT,$0
MOVD z+0(FP), R3
MOVD z_len+8(FP), R0
MOVD x+24(FP), R1
MOVD y+48(FP), R2
CMP R0, R0 // set carry flag
loop:
CBZ R0, done // careful not to touch the carry flag
MOVD.P 8(R1), R4
MOVD.P 8(R2), R5
SBCS R5, R4
MOVD.P R4, 8(R3)
SUB $1, R0
B loop
done:
CSET LO, R0 // extract carry flag
MOVD R0, c+72(FP)
RET
// func addVW(z, x []Word, y Word) (c Word)
TEXT ·addVW(SB),NOSPLIT,$0
MOVD z+0(FP), R3
MOVD z_len+8(FP), R0
MOVD x+24(FP), R1
MOVD y+48(FP), R2
CBZ R0, return_y
MOVD.P 8(R1), R4
ADDS R2, R4
MOVD.P R4, 8(R3)
SUB $1, R0
loop:
CBZ R0, done // careful not to touch the carry flag
MOVD.P 8(R1), R4
ADCS $0, R4
MOVD.P R4, 8(R3)
SUB $1, R0
B loop
done:
CSET HS, R0 // extract carry flag
MOVD R0, c+56(FP)
RET
return_y: // z is empty; copy y to c
MOVD R2, c+56(FP)
RET
// func subVW(z, x []Word, y Word) (c Word)
TEXT ·subVW(SB),NOSPLIT,$0
MOVD z+0(FP), R3
MOVD z_len+8(FP), R0
MOVD x+24(FP), R1
MOVD y+48(FP), R2
CBZ R0, rety
MOVD.P 8(R1), R4
SUBS R2, R4
MOVD.P R4, 8(R3)
SUB $1, R0
loop:
CBZ R0, done // careful not to touch the carry flag
MOVD.P 8(R1), R4
SBCS $0, R4
MOVD.P R4, 8(R3)
SUB $1, R0
B loop
done:
CSET LO, R0 // extract carry flag
MOVD R0, c+56(FP)
RET
rety: // z is empty; copy y to c
MOVD R2, c+56(FP)
RET
// func shlVU(z, x []Word, s uint) (c Word)
TEXT ·shlVU(SB),NOSPLIT,$0
B ·shlVU_g(SB)
// func shrVU(z, x []Word, s uint) (c Word)
TEXT ·shrVU(SB),NOSPLIT,$0
B ·shrVU_g(SB)
// func mulAddVWW(z, x []Word, y, r Word) (c Word)
TEXT ·mulAddVWW(SB),NOSPLIT,$0
MOVD z+0(FP), R1
MOVD z_len+8(FP), R0
MOVD x+24(FP), R2
MOVD y+48(FP), R3
MOVD r+56(FP), R4
loop:
CBZ R0, done
MOVD.P 8(R2), R5
UMULH R5, R3, R7
MUL R5, R3, R6
ADDS R4, R6
ADC $0, R7
MOVD.P R6, 8(R1)
MOVD R7, R4
SUB $1, R0
B loop
done:
MOVD R4, c+64(FP)
RET
// func addMulVVW(z, x []Word, y Word) (c Word)
TEXT ·addMulVVW(SB),NOSPLIT,$0
B ·addMulVVW_g(SB)
// func divWVW(z []Word, xn Word, x []Word, y Word) (r Word)
TEXT ·divWVW(SB),NOSPLIT,$0
B ·divWVW_g(SB)