github.com/mh-cbon/go@v0.0.0-20160603070303-9e112a3fe4c0/src/cmd/compile/internal/ssa/cse_test.go (about)

     1  // Copyright 2016 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  package ssa
     6  
     7  import "testing"
     8  
     9  type tstAux struct {
    10  	s string
    11  }
    12  
    13  // This tests for a bug found when partitioning, but not sorting by the Aux value.
    14  func TestCSEAuxPartitionBug(t *testing.T) {
    15  	c := testConfig(t)
    16  	arg1Aux := &tstAux{"arg1-aux"}
    17  	arg2Aux := &tstAux{"arg2-aux"}
    18  	arg3Aux := &tstAux{"arg3-aux"}
    19  
    20  	// construct lots of values with args that have aux values and place
    21  	// them in an order that triggers the bug
    22  	fun := Fun(c, "entry",
    23  		Bloc("entry",
    24  			Valu("start", OpInitMem, TypeMem, 0, nil),
    25  			Valu("sp", OpSP, TypeBytePtr, 0, nil),
    26  			Valu("r7", OpAdd64, TypeInt64, 0, nil, "arg3", "arg1"),
    27  			Valu("r1", OpAdd64, TypeInt64, 0, nil, "arg1", "arg2"),
    28  			Valu("arg1", OpArg, TypeInt64, 0, arg1Aux),
    29  			Valu("arg2", OpArg, TypeInt64, 0, arg2Aux),
    30  			Valu("arg3", OpArg, TypeInt64, 0, arg3Aux),
    31  			Valu("r9", OpAdd64, TypeInt64, 0, nil, "r7", "r8"),
    32  			Valu("r4", OpAdd64, TypeInt64, 0, nil, "r1", "r2"),
    33  			Valu("r8", OpAdd64, TypeInt64, 0, nil, "arg3", "arg2"),
    34  			Valu("r2", OpAdd64, TypeInt64, 0, nil, "arg1", "arg2"),
    35  			Valu("raddr", OpAddr, TypeInt64Ptr, 0, nil, "sp"),
    36  			Valu("raddrdef", OpVarDef, TypeMem, 0, nil, "start"),
    37  			Valu("r6", OpAdd64, TypeInt64, 0, nil, "r4", "r5"),
    38  			Valu("r3", OpAdd64, TypeInt64, 0, nil, "arg1", "arg2"),
    39  			Valu("r5", OpAdd64, TypeInt64, 0, nil, "r2", "r3"),
    40  			Valu("r10", OpAdd64, TypeInt64, 0, nil, "r6", "r9"),
    41  			Valu("rstore", OpStore, TypeMem, 8, nil, "raddr", "r10", "raddrdef"),
    42  			Goto("exit")),
    43  		Bloc("exit",
    44  			Exit("rstore")))
    45  
    46  	CheckFunc(fun.f)
    47  	domTree(fun.f)
    48  	cse(fun.f)
    49  	deadcode(fun.f)
    50  	CheckFunc(fun.f)
    51  
    52  	s1Cnt := 2
    53  	// r1 == r2 == r3, needs to remove two of this set
    54  	s2Cnt := 1
    55  	// r4 == r5, needs to remove one of these
    56  	for k, v := range fun.values {
    57  		if v.Op == OpInvalid {
    58  			switch k {
    59  			case "r1":
    60  				fallthrough
    61  			case "r2":
    62  				fallthrough
    63  			case "r3":
    64  				if s1Cnt == 0 {
    65  					t.Errorf("cse removed all of r1,r2,r3")
    66  				}
    67  				s1Cnt--
    68  
    69  			case "r4":
    70  				fallthrough
    71  			case "r5":
    72  				if s2Cnt == 0 {
    73  					t.Errorf("cse removed all of r4,r5")
    74  				}
    75  				s2Cnt--
    76  			default:
    77  				t.Errorf("cse removed %s, but shouldn't have", k)
    78  			}
    79  		}
    80  	}
    81  
    82  	if s1Cnt != 0 || s2Cnt != 0 {
    83  		t.Errorf("%d values missed during cse", s1Cnt+s2Cnt)
    84  	}
    85  }
    86  
    87  // TestZCSE tests the zero arg cse.
    88  func TestZCSE(t *testing.T) {
    89  	c := testConfig(t)
    90  
    91  	fun := Fun(c, "entry",
    92  		Bloc("entry",
    93  			Valu("start", OpInitMem, TypeMem, 0, nil),
    94  			Valu("sp", OpSP, TypeBytePtr, 0, nil),
    95  			Valu("sb1", OpSB, TypeBytePtr, 0, nil),
    96  			Valu("sb2", OpSB, TypeBytePtr, 0, nil),
    97  			Valu("addr1", OpAddr, TypeInt64Ptr, 0, nil, "sb1"),
    98  			Valu("addr2", OpAddr, TypeInt64Ptr, 0, nil, "sb2"),
    99  			Valu("a1ld", OpLoad, TypeInt64, 0, nil, "addr1", "start"),
   100  			Valu("a2ld", OpLoad, TypeInt64, 0, nil, "addr2", "start"),
   101  			Valu("c1", OpConst64, TypeInt64, 1, nil),
   102  			Valu("r1", OpAdd64, TypeInt64, 0, nil, "a1ld", "c1"),
   103  			Valu("c2", OpConst64, TypeInt64, 1, nil),
   104  			Valu("r2", OpAdd64, TypeInt64, 0, nil, "a2ld", "c2"),
   105  			Valu("r3", OpAdd64, TypeInt64, 0, nil, "r1", "r2"),
   106  			Valu("raddr", OpAddr, TypeInt64Ptr, 0, nil, "sp"),
   107  			Valu("raddrdef", OpVarDef, TypeMem, 0, nil, "start"),
   108  			Valu("rstore", OpStore, TypeMem, 8, nil, "raddr", "r3", "raddrdef"),
   109  			Goto("exit")),
   110  		Bloc("exit",
   111  			Exit("rstore")))
   112  
   113  	CheckFunc(fun.f)
   114  	zcse(fun.f)
   115  	deadcode(fun.f)
   116  	CheckFunc(fun.f)
   117  
   118  	if fun.values["c1"].Op != OpInvalid && fun.values["c2"].Op != OpInvalid {
   119  		t.Errorf("zsce should have removed c1 or c2")
   120  	}
   121  	if fun.values["sb1"].Op != OpInvalid && fun.values["sb2"].Op != OpInvalid {
   122  		t.Errorf("zsce should have removed sb1 or sb2")
   123  	}
   124  }