| // Copyright 2019 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 路Count(SB),NOSPLIT,$0-20 | |
| MOVW b_base+0(FP), R0 | |
| MOVW b_len+4(FP), R1 | |
| MOVBU c+12(FP), R2 | |
| MOVW $ret+16(FP), R7 | |
| B countbytebody<>(SB) | |
| TEXT 路CountString(SB),NOSPLIT,$0-16 | |
| MOVW s_base+0(FP), R0 | |
| MOVW s_len+4(FP), R1 | |
| MOVBU c+8(FP), R2 | |
| MOVW $ret+12(FP), R7 | |
| B countbytebody<>(SB) | |
| // Input: | |
| // R0: data | |
| // R1: data length | |
| // R2: byte to find | |
| // R7: address to put result | |
| // | |
| // On exit: | |
| // R4 and R8 are clobbered | |
| TEXT countbytebody<>(SB),NOSPLIT,$0 | |
| MOVW $0, R8 // R8 = count of byte to search | |
| CMP $0, R1 | |
| B.EQ done // short path to handle 0-byte case | |
| ADD R0, R1 // R1 is the end of the range | |
| byte_loop: | |
| MOVBU.P 1(R0), R4 | |
| CMP R4, R2 | |
| ADD.EQ $1, R8 | |
| CMP R0, R1 | |
| B.NE byte_loop | |
| done: | |
| MOVW R8, (R7) | |
| RET | |