1// Copyright 2020 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 ·CountString<ABIInternal>(SB),NOSPLIT,$0-32
9 // X10 = s_base
10 // X11 = s_len
11 // X12 = byte to count
12 MOV X12, X13
13 JMP ·Count<ABIInternal>(SB)
14
15TEXT ·Count<ABIInternal>(SB),NOSPLIT,$0-40
16 // X10 = b_base
17 // X11 = b_len
18 // X12 = b_cap (unused)
19 // X13 = byte to count (want in X12)
20 AND $0xff, X13, X12
21 MOV ZERO, X14 // count
22 ADD X10, X11 // end
23
24 PCALIGN $16
25loop:
26 BEQ X10, X11, done
27 MOVBU (X10), X15
28 ADD $1, X10
29 BNE X12, X15, loop
30 ADD $1, X14
31 JMP loop
32
33done:
34 MOV X14, X10
35 RET
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