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Diffstat (limited to 'src/internal/bytealg/indexbyte_arm.s')
| -rw-r--r-- | src/internal/bytealg/indexbyte_arm.s | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/internal/bytealg/indexbyte_arm.s b/src/internal/bytealg/indexbyte_arm.s new file mode 100644 index 0000000..faf9797 --- /dev/null +++ b/src/internal/bytealg/indexbyte_arm.s @@ -0,0 +1,46 @@ +// 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 |