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indexbyte_arm.s
// 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
SIMPAN
BATAL