Text file src/internal/bytealg/indexbyte_arm.s

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include "go_asm.h"
     6	#include "textflag.h"
     7	
     8	TEXT ·IndexByte(SB),NOSPLIT,$0-20
     9		MOVW	b_base+0(FP), R0
    10		MOVW	b_len+4(FP), R1
    11		MOVBU	c+12(FP), R2	// byte to find
    12		MOVW	$ret+16(FP), R5
    13		B	indexbytebody<>(SB)
    14	
    15	TEXT ·IndexByteString(SB),NOSPLIT,$0-16
    16		MOVW	s_base+0(FP), R0
    17		MOVW	s_len+4(FP), R1
    18		MOVBU	c+8(FP), R2	// byte to find
    19		MOVW	$ret+12(FP), R5
    20		B	indexbytebody<>(SB)
    21	
    22	// input:
    23	//  R0: data
    24	//  R1: data length
    25	//  R2: byte to find
    26	//  R5: address to put result
    27	TEXT indexbytebody<>(SB),NOSPLIT,$0-0
    28		MOVW	R0, R4		// store base for later
    29		ADD	R0, R1		// end
    30	
    31	loop:
    32		CMP	R0, R1
    33		B.EQ	notfound
    34		MOVBU.P	1(R0), R3
    35		CMP	R2, R3
    36		B.NE	loop
    37	
    38		SUB	$1, R0		// R0 will be one beyond the position we want
    39		SUB	R4, R0		// remove base
    40		MOVW	R0, (R5)
    41		RET
    42	
    43	notfound:
    44		MOVW	$-1, R0
    45		MOVW	R0, (R5)
    46		RET

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