// Copyright 2018 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 "go_asm.h"

#include "textflag.h"

TEXT ·IndexByte(SB),NOSPLIT,$0-20

MOVW b_base+0(FP), R0

MOVW b_len+4(FP), R1

MOVBU c+12(FP), R2 // byte to find

MOVW $ret+16(FP), R5

B indexbytebody<>(SB)

TEXT ·IndexByteString(SB),NOSPLIT,$0-16

MOVW s_base+0(FP), R0

MOVW s_len+4(FP), R1

MOVBU c+8(FP), R2 // byte to find

MOVW $ret+12(FP), R5

B indexbytebody<>(SB)

// input:

// R0: data

// R1: data length

// R2: byte to find

// R5: address to put result

TEXT indexbytebody<>(SB),NOSPLIT,$0-0

MOVW R0, R4 // store base for later

ADD R0, R1 // end

loop:

CMP R0, R1

B.EQ notfound

MOVBU.P 1(R0), R3

CMP R2, R3

B.NE loop

SUB $1, R0 // R0 will be one beyond the position we want

SUB R4, R0 // remove base

MOVW R0, (R5)

RET

notfound:

MOVW $-1, R0

MOVW R0, (R5)

RET