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Diffstat (limited to 'src/internal/bytealg/indexbyte_wasm.s')
| -rw-r--r-- | src/internal/bytealg/indexbyte_wasm.s | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/src/internal/bytealg/indexbyte_wasm.s b/src/internal/bytealg/indexbyte_wasm.s new file mode 100644 index 0000000..ef4bd93 --- /dev/null +++ b/src/internal/bytealg/indexbyte_wasm.s @@ -0,0 +1,195 @@ +// Copyright 2018 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 ·IndexByte(SB), NOSPLIT, $0-40 + I64Load b_base+0(FP) + I32WrapI64 + I32Load8U c+24(FP) + I64Load b_len+8(FP) + I32WrapI64 + Call memchr<>(SB) + I64ExtendI32S + Set R0 + + Get SP + I64Const $-1 + Get R0 + I64Load b_base+0(FP) + I64Sub + Get R0 + I64Eqz $0 + Select + I64Store ret+32(FP) + + RET + +TEXT ·IndexByteString(SB), NOSPLIT, $0-32 + Get SP + I64Load s_base+0(FP) + I32WrapI64 + I32Load8U c+16(FP) + I64Load s_len+8(FP) + I32WrapI64 + Call memchr<>(SB) + I64ExtendI32S + Set R0 + + I64Const $-1 + Get R0 + I64Load s_base+0(FP) + I64Sub + Get R0 + I64Eqz $0 + Select + I64Store ret+24(FP) + + RET + +// initially compiled with emscripten and then modified over time. +// params: +// R0: s +// R1: c +// R2: len +// ret: index +TEXT memchr<>(SB), NOSPLIT, $0 + Get R1 + Set R4 + Block + Block + Get R2 + I32Const $0 + I32Ne + Tee R3 + Get R0 + I32Const $3 + I32And + I32Const $0 + I32Ne + I32And + If + Loop + Get R0 + I32Load8U $0 + Get R1 + I32Eq + BrIf $2 + Get R2 + I32Const $-1 + I32Add + Tee R2 + I32Const $0 + I32Ne + Tee R3 + Get R0 + I32Const $1 + I32Add + Tee R0 + I32Const $3 + I32And + I32Const $0 + I32Ne + I32And + BrIf $0 + End + End + Get R3 + BrIf $0 + I32Const $0 + Set R1 + Br $1 + End + Get R0 + I32Load8U $0 + Get R4 + Tee R3 + I32Eq + If + Get R2 + Set R1 + Else + Get R4 + I32Const $16843009 + I32Mul + Set R4 + Block + Block + Get R2 + I32Const $3 + I32GtU + If + Get R2 + Set R1 + Loop + Get R0 + I32Load $0 + Get R4 + I32Xor + Tee R2 + I32Const $-2139062144 + I32And + I32Const $-2139062144 + I32Xor + Get R2 + I32Const $-16843009 + I32Add + I32And + I32Eqz + If + Get R0 + I32Const $4 + I32Add + Set R0 + Get R1 + I32Const $-4 + I32Add + Tee R1 + I32Const $3 + I32GtU + BrIf $1 + Br $3 + End + End + Else + Get R2 + Set R1 + Br $1 + End + Br $1 + End + Get R1 + I32Eqz + If + I32Const $0 + Set R1 + Br $3 + End + End + Loop + Get R0 + I32Load8U $0 + Get R3 + I32Eq + BrIf $2 + Get R0 + I32Const $1 + I32Add + Set R0 + Get R1 + I32Const $-1 + I32Add + Tee R1 + BrIf $0 + I32Const $0 + Set R1 + End + End + End + Get R0 + I32Const $0 + Get R1 + Select + Return |