github.com/hikaru7719/go@v0.0.0-20181025140707-c8b2ac68906a/src/internal/bytealg/equal_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 ·Equal(SB), NOSPLIT, $0-49
     9  	MOVD a_len+8(FP), R0
    10  	MOVD b_len+32(FP), R1
    11  	Get R0
    12  	Get R1
    13  	I64Eq
    14  	If
    15  		Get SP
    16  		I64Load a+0(FP)
    17  		I64Load b+24(FP)
    18  		Get R0
    19  		Call memeqbody<>(SB)
    20  		I64Store8 ret+48(FP)
    21  	Else
    22  		Get SP
    23  		I64Const $0
    24  		I64Store8 ret+48(FP)
    25  	End
    26  	RET
    27  
    28  TEXT bytes·Equal(SB), NOSPLIT, $0-49
    29  	FUNCDATA $0, ·Equal·args_stackmap(SB)
    30  	MOVD a_len+8(FP), R0
    31  	MOVD b_len+32(FP), R1
    32  	Get R0
    33  	Get R1
    34  	I64Eq
    35  	If
    36  		Get SP
    37  		I64Load a+0(FP)
    38  		I64Load b+24(FP)
    39  		Get R0
    40  		Call memeqbody<>(SB)
    41  		I64Store8 ret+48(FP)
    42  	Else
    43  		Get SP
    44  		I64Const $0
    45  		I64Store8 ret+48(FP)
    46  	End
    47  	RET
    48  
    49  // memequal(p, q unsafe.Pointer, size uintptr) bool
    50  TEXT runtime·memequal(SB), NOSPLIT, $0-25
    51  	Get SP
    52  	I64Load a+0(FP)
    53  	I64Load b+8(FP)
    54  	I64Load size+16(FP)
    55  	Call memeqbody<>(SB)
    56  	I64Store8 ret+24(FP)
    57  	RET
    58  
    59  // memequal_varlen(a, b unsafe.Pointer) bool
    60  TEXT runtime·memequal_varlen(SB), NOSPLIT, $0-17
    61  	Get SP
    62  	I64Load a+0(FP)
    63  	I64Load b+8(FP)
    64  	I64Load 8(CTXT) // compiler stores size at offset 8 in the closure
    65  	Call memeqbody<>(SB)
    66  	I64Store8 ret+16(FP)
    67  	RET
    68  
    69  // params: a, b, len
    70  // ret: 0/1
    71  TEXT memeqbody<>(SB), NOSPLIT, $0-0
    72  	Get R0
    73  	Get R1
    74  	I64Eq
    75  	If
    76  		I64Const $1
    77  		Return
    78  	End
    79  
    80  loop:
    81  	Loop
    82  		Get R2
    83  		I64Eqz
    84  		If
    85  			I64Const $1
    86  			Return
    87  		End
    88  
    89  		Get R0
    90  		I32WrapI64
    91  		I64Load8U $0
    92  		Get R1
    93  		I32WrapI64
    94  		I64Load8U $0
    95  		I64Ne
    96  		If
    97  			I64Const $0
    98  			Return
    99  		End
   100  
   101  		Get R0
   102  		I64Const $1
   103  		I64Add
   104  		Set R0
   105  
   106  		Get R1
   107  		I64Const $1
   108  		I64Add
   109  		Set R1
   110  
   111  		Get R2
   112  		I64Const $1
   113  		I64Sub
   114  		Set R2
   115  
   116  		Br loop
   117  	End
   118  	UNDEF