mirror of
https://github.com/octoleo/syncthing.git
synced 2024-11-19 03:25:16 +00:00
293 lines
4.4 KiB
ArmAsm
293 lines
4.4 KiB
ArmAsm
// 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.
|
|
|
|
#include "textflag.h"
|
|
|
|
// This file provides fast assembly versions for the elementary
|
|
// arithmetic operations on vectors implemented in arith.go.
|
|
|
|
// func addVV(z, x, y []Word) (c Word)
|
|
TEXT ·addVV(SB),NOSPLIT,$0
|
|
ADD.S $0, R0 // clear carry flag
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R4
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
ADD R4<<2, R1, R4
|
|
B E1
|
|
L1:
|
|
MOVW.P 4(R2), R5
|
|
MOVW.P 4(R3), R6
|
|
ADC.S R6, R5
|
|
MOVW.P R5, 4(R1)
|
|
E1:
|
|
TEQ R1, R4
|
|
BNE L1
|
|
|
|
MOVW $0, R0
|
|
MOVW.CS $1, R0
|
|
MOVW R0, c+36(FP)
|
|
RET
|
|
|
|
|
|
// func subVV(z, x, y []Word) (c Word)
|
|
// (same as addVV except for SBC instead of ADC and label names)
|
|
TEXT ·subVV(SB),NOSPLIT,$0
|
|
SUB.S $0, R0 // clear borrow flag
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R4
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
ADD R4<<2, R1, R4
|
|
B E2
|
|
L2:
|
|
MOVW.P 4(R2), R5
|
|
MOVW.P 4(R3), R6
|
|
SBC.S R6, R5
|
|
MOVW.P R5, 4(R1)
|
|
E2:
|
|
TEQ R1, R4
|
|
BNE L2
|
|
|
|
MOVW $0, R0
|
|
MOVW.CC $1, R0
|
|
MOVW R0, c+36(FP)
|
|
RET
|
|
|
|
|
|
// func addVW(z, x []Word, y Word) (c Word)
|
|
TEXT ·addVW(SB),NOSPLIT,$0
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R4
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
ADD R4<<2, R1, R4
|
|
TEQ R1, R4
|
|
BNE L3a
|
|
MOVW R3, c+28(FP)
|
|
RET
|
|
L3a:
|
|
MOVW.P 4(R2), R5
|
|
ADD.S R3, R5
|
|
MOVW.P R5, 4(R1)
|
|
B E3
|
|
L3:
|
|
MOVW.P 4(R2), R5
|
|
ADC.S $0, R5
|
|
MOVW.P R5, 4(R1)
|
|
E3:
|
|
TEQ R1, R4
|
|
BNE L3
|
|
|
|
MOVW $0, R0
|
|
MOVW.CS $1, R0
|
|
MOVW R0, c+28(FP)
|
|
RET
|
|
|
|
|
|
// func subVW(z, x []Word, y Word) (c Word)
|
|
TEXT ·subVW(SB),NOSPLIT,$0
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R4
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
ADD R4<<2, R1, R4
|
|
TEQ R1, R4
|
|
BNE L4a
|
|
MOVW R3, c+28(FP)
|
|
RET
|
|
L4a:
|
|
MOVW.P 4(R2), R5
|
|
SUB.S R3, R5
|
|
MOVW.P R5, 4(R1)
|
|
B E4
|
|
L4:
|
|
MOVW.P 4(R2), R5
|
|
SBC.S $0, R5
|
|
MOVW.P R5, 4(R1)
|
|
E4:
|
|
TEQ R1, R4
|
|
BNE L4
|
|
|
|
MOVW $0, R0
|
|
MOVW.CC $1, R0
|
|
MOVW R0, c+28(FP)
|
|
RET
|
|
|
|
|
|
// func shlVU(z, x []Word, s uint) (c Word)
|
|
TEXT ·shlVU(SB),NOSPLIT,$0
|
|
MOVW z_len+4(FP), R5
|
|
TEQ $0, R5
|
|
BEQ X7
|
|
|
|
MOVW z+0(FP), R1
|
|
MOVW x+12(FP), R2
|
|
ADD R5<<2, R2, R2
|
|
ADD R5<<2, R1, R5
|
|
MOVW s+24(FP), R3
|
|
TEQ $0, R3 // shift 0 is special
|
|
BEQ Y7
|
|
ADD $4, R1 // stop one word early
|
|
MOVW $32, R4
|
|
SUB R3, R4
|
|
MOVW $0, R7
|
|
|
|
MOVW.W -4(R2), R6
|
|
MOVW R6<<R3, R7
|
|
MOVW R6>>R4, R6
|
|
MOVW R6, c+28(FP)
|
|
B E7
|
|
|
|
L7:
|
|
MOVW.W -4(R2), R6
|
|
ORR R6>>R4, R7
|
|
MOVW.W R7, -4(R5)
|
|
MOVW R6<<R3, R7
|
|
E7:
|
|
TEQ R1, R5
|
|
BNE L7
|
|
|
|
MOVW R7, -4(R5)
|
|
RET
|
|
|
|
Y7: // copy loop, because shift 0 == shift 32
|
|
MOVW.W -4(R2), R6
|
|
MOVW.W R6, -4(R5)
|
|
TEQ R1, R5
|
|
BNE Y7
|
|
|
|
X7:
|
|
MOVW $0, R1
|
|
MOVW R1, c+28(FP)
|
|
RET
|
|
|
|
|
|
// func shrVU(z, x []Word, s uint) (c Word)
|
|
TEXT ·shrVU(SB),NOSPLIT,$0
|
|
MOVW z_len+4(FP), R5
|
|
TEQ $0, R5
|
|
BEQ X6
|
|
|
|
MOVW z+0(FP), R1
|
|
MOVW x+12(FP), R2
|
|
ADD R5<<2, R1, R5
|
|
MOVW s+24(FP), R3
|
|
TEQ $0, R3 // shift 0 is special
|
|
BEQ Y6
|
|
SUB $4, R5 // stop one word early
|
|
MOVW $32, R4
|
|
SUB R3, R4
|
|
MOVW $0, R7
|
|
|
|
// first word
|
|
MOVW.P 4(R2), R6
|
|
MOVW R6>>R3, R7
|
|
MOVW R6<<R4, R6
|
|
MOVW R6, c+28(FP)
|
|
B E6
|
|
|
|
// word loop
|
|
L6:
|
|
MOVW.P 4(R2), R6
|
|
ORR R6<<R4, R7
|
|
MOVW.P R7, 4(R1)
|
|
MOVW R6>>R3, R7
|
|
E6:
|
|
TEQ R1, R5
|
|
BNE L6
|
|
|
|
MOVW R7, 0(R1)
|
|
RET
|
|
|
|
Y6: // copy loop, because shift 0 == shift 32
|
|
MOVW.P 4(R2), R6
|
|
MOVW.P R6, 4(R1)
|
|
TEQ R1, R5
|
|
BNE Y6
|
|
|
|
X6:
|
|
MOVW $0, R1
|
|
MOVW R1, c+28(FP)
|
|
RET
|
|
|
|
|
|
// func mulAddVWW(z, x []Word, y, r Word) (c Word)
|
|
TEXT ·mulAddVWW(SB),NOSPLIT,$0
|
|
MOVW $0, R0
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R5
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
MOVW r+28(FP), R4
|
|
ADD R5<<2, R1, R5
|
|
B E8
|
|
|
|
// word loop
|
|
L8:
|
|
MOVW.P 4(R2), R6
|
|
MULLU R6, R3, (R7, R6)
|
|
ADD.S R4, R6
|
|
ADC R0, R7
|
|
MOVW.P R6, 4(R1)
|
|
MOVW R7, R4
|
|
E8:
|
|
TEQ R1, R5
|
|
BNE L8
|
|
|
|
MOVW R4, c+32(FP)
|
|
RET
|
|
|
|
|
|
// func addMulVVW(z, x []Word, y Word) (c Word)
|
|
TEXT ·addMulVVW(SB),NOSPLIT,$0
|
|
MOVW $0, R0
|
|
MOVW z+0(FP), R1
|
|
MOVW z_len+4(FP), R5
|
|
MOVW x+12(FP), R2
|
|
MOVW y+24(FP), R3
|
|
ADD R5<<2, R1, R5
|
|
MOVW $0, R4
|
|
B E9
|
|
|
|
// word loop
|
|
L9:
|
|
MOVW.P 4(R2), R6
|
|
MULLU R6, R3, (R7, R6)
|
|
ADD.S R4, R6
|
|
ADC R0, R7
|
|
MOVW 0(R1), R4
|
|
ADD.S R4, R6
|
|
ADC R0, R7
|
|
MOVW.P R6, 4(R1)
|
|
MOVW R7, R4
|
|
E9:
|
|
TEQ R1, R5
|
|
BNE L9
|
|
|
|
MOVW R4, c+28(FP)
|
|
RET
|
|
|
|
|
|
// func divWVW(z* Word, xn Word, x []Word, y Word) (r Word)
|
|
TEXT ·divWVW(SB),NOSPLIT,$0
|
|
// ARM has no multiword division, so use portable code.
|
|
B ·divWVW_g(SB)
|
|
|
|
|
|
// func divWW(x1, x0, y Word) (q, r Word)
|
|
TEXT ·divWW(SB),NOSPLIT,$0
|
|
// ARM has no multiword division, so use portable code.
|
|
B ·divWW_g(SB)
|
|
|
|
|
|
// func mulWW(x, y Word) (z1, z0 Word)
|
|
TEXT ·mulWW(SB),NOSPLIT,$0
|
|
MOVW x+0(FP), R1
|
|
MOVW y+4(FP), R2
|
|
MULLU R1, R2, (R4, R3)
|
|
MOVW R4, z1+8(FP)
|
|
MOVW R3, z0+12(FP)
|
|
RET
|