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count_riscv64.s
// Copyright 2020 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<ABIInternal>(SB),NOSPLIT,$0-40 // X10 = b_base // X11 = b_len // X12 = b_cap (unused) // X13 = byte to count (want in X12) AND $0xff, X13, X12 MOV ZERO, X14 // count ADD X10, X11 // end PCALIGN $16 loop: BEQ X10, X11, done MOVBU (X10), X15 ADD $1, X10 BNE X12, X15, loop ADD $1, X14 JMP loop done: MOV X14, X10 RET TEXT ·CountString<ABIInternal>(SB),NOSPLIT,$0-32 // X10 = s_base // X11 = s_len // X12 = byte to count AND $0xff, X12 MOV ZERO, X14 // count ADD X10, X11 // end PCALIGN $16 loop: BEQ X10, X11, done MOVBU (X10), X15 ADD $1, X10 BNE X12, X15, loop ADD $1, X14 JMP loop done: MOV X14, X10 RET
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