1// Copyright 2019 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
8TEXT ·Count(SB),NOSPLIT,$0-20
9 MOVW b_base+0(FP), R0
10 MOVW b_len+4(FP), R1
11 MOVBU c+12(FP), R2
12 MOVW $ret+16(FP), R7
13 B countbytebody<>(SB)
14
15TEXT ·CountString(SB),NOSPLIT,$0-16
16 MOVW s_base+0(FP), R0
17 MOVW s_len+4(FP), R1
18 MOVBU c+8(FP), R2
19 MOVW $ret+12(FP), R7
20 B countbytebody<>(SB)
21
22// Input:
23// R0: data
24// R1: data length
25// R2: byte to find
26// R7: address to put result
27//
28// On exit:
29// R4 and R8 are clobbered
30TEXT countbytebody<>(SB),NOSPLIT,$0
31 MOVW $0, R8 // R8 = count of byte to search
32 CMP $0, R1
33 B.EQ done // short path to handle 0-byte case
34 ADD R0, R1 // R1 is the end of the range
35byte_loop:
36 MOVBU.P 1(R0), R4
37 CMP R4, R2
38 ADD.EQ $1, R8
39 CMP R0, R1
40 B.NE byte_loop
41done:
42 MOVW R8, (R7)
43 RET
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