// Copyright 2019 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<ABIInternal>(SB),NOSPLIT,$0-40
#ifndef GOEXPERIMENT_regabiargs
	MOV	b_base+0(FP), X10
	MOV	b_len+8(FP), X11
	MOVBU	c+24(FP), X13	// byte to find
#endif
	// X10 = b_base
	// X11 = b_len
	// X12 = b_cap (unused)
	// X13 = byte to find
	MOV	X10, X12		// store base for later
	ADD	X10, X11		// end
	ADD	$-1, X10

loop:
	ADD	$1, X10
	BEQ	X10, X11, notfound
	MOVBU	(X10), X14
	BNE	X13, X14, loop

	SUB	X12, X10		// remove base
#ifndef GOEXPERIMENT_regabiargs
	MOV	X10, ret+32(FP)
#endif
	RET

notfound:
	MOV	$-1, X10
#ifndef GOEXPERIMENT_regabiargs
	MOV	X10, ret+32(FP)
#endif
	RET

TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT,$0-32
#ifndef GOEXPERIMENT_regabiargs
	MOV	s_base+0(FP), X10
	MOV	s_len+8(FP), X11
	MOVBU	c+16(FP), X12	// byte to find
#endif
	// X10 = b_base
	// X11 = b_len
	// X12 = byte to find
	MOV	X10, X13		// store base for later
	ADD	X10, X11		// end
	ADD	$-1, X10

loop:
	ADD	$1, X10
	BEQ	X10, X11, notfound
	MOVBU	(X10), X14
	BNE	X12, X14, loop

	SUB	X13, X10		// remove base
#ifndef GOEXPERIMENT_regabiargs
	MOV	X10, ret+24(FP)
#endif
	RET

notfound:
	MOV	$-1, X10
#ifndef GOEXPERIMENT_regabiargs
	MOV	X10, ret+24(FP)
#endif
	RET