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indexbyte_wasm.s
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// 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)
I64ExtendI32U
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)
I64ExtendI32U
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