mirror of https://go.googlesource.com/go
53 lines
905 B
ArmAsm
53 lines
905 B
ArmAsm
// Copyright 2022 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<ABIInternal>(SB),NOSPLIT,$0-40
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// R4 = b_base
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// R5 = b_len
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// R6 = b_cap (unused)
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// R7 = byte to find
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AND $0xff, R7
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MOVV R4, R6 // store base for later
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ADDV R4, R5 // end
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ADDV $-1, R4
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PCALIGN $16
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loop:
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ADDV $1, R4
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BEQ R4, R5, notfound
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MOVBU (R4), R8
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BNE R7, R8, loop
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SUBV R6, R4 // remove base
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RET
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notfound:
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MOVV $-1, R4
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RET
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TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT,$0-32
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// R4 = s_base
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// R5 = s_len
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// R6 = byte to find
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MOVV R4, R7 // store base for later
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ADDV R4, R5 // end
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ADDV $-1, R4
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PCALIGN $16
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loop:
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ADDV $1, R4
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BEQ R4, R5, notfound
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MOVBU (R4), R8
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BNE R6, R8, loop
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SUBV R7, R4 // remove base
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RET
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notfound:
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MOVV $-1, R4
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RET
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