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// Copyright 2020 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.
//go:build !math_big_pure_go && riscv64
#include "textflag.h"
// This file provides fast assembly versions for the elementary
// arithmetic operations on vectors implemented in arith.go.
TEXT ·addVV(SB),NOSPLIT,$0
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MOV x+24(FP), X5
MOV y+48(FP), X6
MOV z+0(FP), X7
MOV z_len+8(FP), X30
MOV $4, X28
MOV $0, X29 // c = 0
BEQZ X30, done
BLTU X30, X28, loop1
loop4:
MOV 0(X5), X8 // x[0]
MOV 0(X6), X9 // y[0]
MOV 8(X5), X11 // x[1]
MOV 8(X6), X12 // y[1]
MOV 16(X5), X14 // x[2]
MOV 16(X6), X15 // y[2]
MOV 24(X5), X17 // x[3]
MOV 24(X6), X18 // y[3]
ADD X8, X9, X21 // z[0] = x[0] + y[0]
SLTU X8, X21, X22
ADD X21, X29, X10 // z[0] = x[0] + y[0] + c
SLTU X21, X10, X23
ADD X22, X23, X29 // next c
ADD X11, X12, X24 // z[1] = x[1] + y[1]
SLTU X11, X24, X25
ADD X24, X29, X13 // z[1] = x[1] + y[1] + c
SLTU X24, X13, X26
ADD X25, X26, X29 // next c
ADD X14, X15, X21 // z[2] = x[2] + y[2]
SLTU X14, X21, X22
ADD X21, X29, X16 // z[2] = x[2] + y[2] + c
SLTU X21, X16, X23
ADD X22, X23, X29 // next c
ADD X17, X18, X21 // z[3] = x[3] + y[3]
SLTU X17, X21, X22
ADD X21, X29, X19 // z[3] = x[3] + y[3] + c
SLTU X21, X19, X23
ADD X22, X23, X29 // next c
MOV X10, 0(X7) // z[0]
MOV X13, 8(X7) // z[1]
MOV X16, 16(X7) // z[2]
MOV X19, 24(X7) // z[3]
ADD $32, X5
ADD $32, X6
ADD $32, X7
SUB $4, X30
BGEU X30, X28, loop4
BEQZ X30, done
loop1:
MOV 0(X5), X10 // x
MOV 0(X6), X11 // y
ADD X10, X11, X12 // z = x + y
SLTU X10, X12, X14
ADD X12, X29, X13 // z = x + y + c
SLTU X12, X13, X15
ADD X14, X15, X29 // next c
MOV X13, 0(X7) // z
ADD $8, X5
ADD $8, X6
ADD $8, X7
SUB $1, X30
BNEZ X30, loop1
done:
MOV X29, c+72(FP) // return c
RET
TEXT ·subVV(SB),NOSPLIT,$0
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MOV x+24(FP), X5
MOV y+48(FP), X6
MOV z+0(FP), X7
MOV z_len+8(FP), X30
MOV $4, X28
MOV $0, X29 // b = 0
BEQZ X30, done
BLTU X30, X28, loop1
loop4:
MOV 0(X5), X8 // x[0]
MOV 0(X6), X9 // y[0]
MOV 8(X5), X11 // x[1]
MOV 8(X6), X12 // y[1]
MOV 16(X5), X14 // x[2]
MOV 16(X6), X15 // y[2]
MOV 24(X5), X17 // x[3]
MOV 24(X6), X18 // y[3]
SUB X9, X8, X21 // z[0] = x[0] - y[0]
SLTU X21, X8, X22
SUB X29, X21, X10 // z[0] = x[0] - y[0] - b
SLTU X10, X21, X23
ADD X22, X23, X29 // next b
SUB X12, X11, X24 // z[1] = x[1] - y[1]
SLTU X24, X11, X25
SUB X29, X24, X13 // z[1] = x[1] - y[1] - b
SLTU X13, X24, X26
ADD X25, X26, X29 // next b
SUB X15, X14, X21 // z[2] = x[2] - y[2]
SLTU X21, X14, X22
SUB X29, X21, X16 // z[2] = x[2] - y[2] - b
SLTU X16, X21, X23
ADD X22, X23, X29 // next b
SUB X18, X17, X21 // z[3] = x[3] - y[3]
SLTU X21, X17, X22
SUB X29, X21, X19 // z[3] = x[3] - y[3] - b
SLTU X19, X21, X23
ADD X22, X23, X29 // next b
MOV X10, 0(X7) // z[0]
MOV X13, 8(X7) // z[1]
MOV X16, 16(X7) // z[2]
MOV X19, 24(X7) // z[3]
ADD $32, X5
ADD $32, X6
ADD $32, X7
SUB $4, X30
BGEU X30, X28, loop4
BEQZ X30, done
loop1:
MOV 0(X5), X10 // x
MOV 0(X6), X11 // y
SUB X11, X10, X12 // z = x - y
SLTU X12, X10, X14
SUB X29, X12, X13 // z = x - y - b
SLTU X13, X12, X15
ADD X14, X15, X29 // next b
MOV X13, 0(X7) // z
ADD $8, X5
ADD $8, X6
ADD $8, X7
SUB $1, X30
BNEZ X30, loop1
done:
MOV X29, c+72(FP) // return b
RET
TEXT ·addVW(SB),NOSPLIT,$0
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MOV x+24(FP), X5
MOV y+48(FP), X6
MOV z+0(FP), X7
MOV z_len+8(FP), X30
MOV $4, X28
MOV X6, X29 // c = y
BEQZ X30, done
BLTU X30, X28, loop1
loop4:
MOV 0(X5), X8 // x[0]
MOV 8(X5), X11 // x[1]
MOV 16(X5), X14 // x[2]
MOV 24(X5), X17 // x[3]
ADD X8, X29, X10 // z[0] = x[0] + c
SLTU X8, X10, X29 // next c
ADD X11, X29, X13 // z[1] = x[1] + c
SLTU X11, X13, X29 // next c
ADD X14, X29, X16 // z[2] = x[2] + c
SLTU X14, X16, X29 // next c
ADD X17, X29, X19 // z[3] = x[3] + c
SLTU X17, X19, X29 // next c
MOV X10, 0(X7) // z[0]
MOV X13, 8(X7) // z[1]
MOV X16, 16(X7) // z[2]
MOV X19, 24(X7) // z[3]
ADD $32, X5
ADD $32, X7
SUB $4, X30
BGEU X30, X28, loop4
BEQZ X30, done
loop1:
MOV 0(X5), X10 // x
ADD X10, X29, X12 // z = x + c
SLTU X10, X12, X29 // next c
MOV X12, 0(X7) // z
ADD $8, X5
ADD $8, X7
SUB $1, X30
BNEZ X30, loop1
done:
MOV X29, c+56(FP) // return c
RET
TEXT ·subVW(SB),NOSPLIT,$0
JMP ·subVW_g(SB)
TEXT ·shlVU(SB),NOSPLIT,$0
JMP ·shlVU_g(SB)
TEXT ·shrVU(SB),NOSPLIT,$0
JMP ·shrVU_g(SB)
TEXT ·mulAddVWW(SB),NOSPLIT,$0
JMP ·mulAddVWW_g(SB)
TEXT ·addMulVVW(SB),NOSPLIT,$0
JMP ·addMulVVW_g(SB)