github.com/JimmyHuang454/JLS-go@v0.0.0-20230831150107-90d536585ba0/internal/bytealg/indexbyte_wasm.s (about)

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include "go_asm.h"
     6  #include "textflag.h"
     7  
     8  TEXT ·IndexByte(SB), NOSPLIT, $0-40
     9  	I64Load b_base+0(FP)
    10  	I32WrapI64
    11  	I32Load8U c+24(FP)
    12  	I64Load b_len+8(FP)
    13  	I32WrapI64
    14  	Call memchr<>(SB)
    15  	I64ExtendI32S
    16  	Set R0
    17  
    18  	Get SP
    19  	I64Const $-1
    20  	Get R0
    21  	I64Load b_base+0(FP)
    22  	I64Sub
    23  	Get R0
    24  	I64Eqz $0
    25  	Select
    26  	I64Store ret+32(FP)
    27  
    28  	RET
    29  
    30  TEXT ·IndexByteString(SB), NOSPLIT, $0-32
    31  	Get SP
    32  	I64Load s_base+0(FP)
    33  	I32WrapI64
    34  	I32Load8U c+16(FP)
    35  	I64Load s_len+8(FP)
    36  	I32WrapI64
    37  	Call memchr<>(SB)
    38  	I64ExtendI32S
    39  	Set R0
    40  
    41  	I64Const $-1
    42  	Get R0
    43  	I64Load s_base+0(FP)
    44  	I64Sub
    45  	Get R0
    46  	I64Eqz $0
    47  	Select
    48  	I64Store ret+24(FP)
    49  
    50  	RET
    51  
    52  // initially compiled with emscripten and then modified over time.
    53  // params:
    54  //   R0: s
    55  //   R1: c
    56  //   R2: len
    57  // ret: index
    58  TEXT memchr<>(SB), NOSPLIT, $0
    59  	Get R1
    60  	Set R4
    61  	Block
    62  		Block
    63  			Get R2
    64  			I32Const $0
    65  			I32Ne
    66  			Tee R3
    67  			Get R0
    68  			I32Const $3
    69  			I32And
    70  			I32Const $0
    71  			I32Ne
    72  			I32And
    73  			If
    74  				Loop
    75  					Get R0
    76  					I32Load8U $0
    77  					Get R1
    78  					I32Eq
    79  					BrIf $2
    80  					Get R2
    81  					I32Const $-1
    82  					I32Add
    83  					Tee R2
    84  					I32Const $0
    85  					I32Ne
    86  					Tee R3
    87  					Get R0
    88  					I32Const $1
    89  					I32Add
    90  					Tee R0
    91  					I32Const $3
    92  					I32And
    93  					I32Const $0
    94  					I32Ne
    95  					I32And
    96  					BrIf $0
    97  				End
    98  			End
    99  			Get R3
   100  			BrIf $0
   101  			I32Const $0
   102  			Set R1
   103  			Br $1
   104  		End
   105  		Get R0
   106  		I32Load8U $0
   107  		Get R4
   108  		Tee R3
   109  		I32Eq
   110  		If
   111  			Get R2
   112  			Set R1
   113  		Else
   114  			Get R4
   115  			I32Const $16843009
   116  			I32Mul
   117  			Set R4
   118  			Block
   119  				Block
   120  					Get R2
   121  					I32Const $3
   122  					I32GtU
   123  					If
   124  						Get R2
   125  						Set R1
   126  						Loop
   127  							Get R0
   128  							I32Load $0
   129  							Get R4
   130  							I32Xor
   131  							Tee R2
   132  							I32Const $-2139062144
   133  							I32And
   134  							I32Const $-2139062144
   135  							I32Xor
   136  							Get R2
   137  							I32Const $-16843009
   138  							I32Add
   139  							I32And
   140  							I32Eqz
   141  							If
   142  								Get R0
   143  								I32Const $4
   144  								I32Add
   145  								Set R0
   146  								Get R1
   147  								I32Const $-4
   148  								I32Add
   149  								Tee R1
   150  								I32Const $3
   151  								I32GtU
   152  								BrIf $1
   153  								Br $3
   154  							End
   155  						End
   156  					Else
   157  						Get R2
   158  						Set R1
   159  						Br $1
   160  					End
   161  					Br $1
   162  				End
   163  				Get R1
   164  				I32Eqz
   165  				If
   166  					I32Const $0
   167  					Set R1
   168  					Br $3
   169  				End
   170  			End
   171  			Loop
   172  				Get R0
   173  				I32Load8U $0
   174  				Get R3
   175  				I32Eq
   176  				BrIf $2
   177  				Get R0
   178  				I32Const $1
   179  				I32Add
   180  				Set R0
   181  				Get R1
   182  				I32Const $-1
   183  				I32Add
   184  				Tee R1
   185  				BrIf $0
   186  				I32Const $0
   187  				Set R1
   188  			End
   189  		End
   190  	End
   191  	Get R0
   192  	I32Const $0
   193  	Get R1
   194  	Select
   195  	Return