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Diffstat (limited to 'src/internal/bytealg/count_riscv64.s')
| -rw-r--r-- | src/internal/bytealg/count_riscv64.s | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/internal/bytealg/count_riscv64.s b/src/internal/bytealg/count_riscv64.s new file mode 100644 index 0000000..d123cbd --- /dev/null +++ b/src/internal/bytealg/count_riscv64.s @@ -0,0 +1,47 @@ +// 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 + +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 + +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 |