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// 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 ·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 ·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