github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/internal/bytealg/indexbyte_arm.s (about) 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