mirror of https://go.googlesource.com/go
47 lines
951 B
ArmAsm
47 lines
951 B
ArmAsm
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "go_asm.h"
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#include "textflag.h"
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TEXT ·IndexByte(SB),NOSPLIT,$0-20
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MOVW b_base+0(FP), R0
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MOVW b_len+4(FP), R1
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MOVBU c+12(FP), R2 // byte to find
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MOVW $ret+16(FP), R5
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B indexbytebody<>(SB)
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TEXT ·IndexByteString(SB),NOSPLIT,$0-16
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MOVW s_base+0(FP), R0
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MOVW s_len+4(FP), R1
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MOVBU c+8(FP), R2 // byte to find
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MOVW $ret+12(FP), R5
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B indexbytebody<>(SB)
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// input:
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// R0: data
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// R1: data length
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// R2: byte to find
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// R5: address to put result
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TEXT indexbytebody<>(SB),NOSPLIT,$0-0
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MOVW R0, R4 // store base for later
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ADD R0, R1 // end
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loop:
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CMP R0, R1
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B.EQ notfound
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MOVBU.P 1(R0), R3
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CMP R2, R3
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B.NE loop
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SUB $1, R0 // R0 will be one beyond the position we want
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SUB R4, R0 // remove base
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MOVW R0, (R5)
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RET
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notfound:
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MOVW $-1, R0
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MOVW R0, (R5)
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RET
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