shortcircuit_test.go

     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 (
     8  	"cmd/compile/internal/types"
     9  	"testing"
    10  )
    11  
    12  func TestShortCircuit(t *testing.T) {
    13  	c := testConfig(t)
    14  
    15  	fun := c.Fun("entry",
    16  		Bloc("entry",
    17  			Valu("mem", OpInitMem, types.TypeMem, 0, nil),
    18  			Valu("arg1", OpArg, c.config.Types.Int64, 0, nil),
    19  			Valu("arg2", OpArg, c.config.Types.Int64, 0, nil),
    20  			Valu("arg3", OpArg, c.config.Types.Int64, 0, nil),
    21  			Goto("b1")),
    22  		Bloc("b1",
    23  			Valu("cmp1", OpLess64, c.config.Types.Bool, 0, nil, "arg1", "arg2"),
    24  			If("cmp1", "b2", "b3")),
    25  		Bloc("b2",
    26  			Valu("cmp2", OpLess64, c.config.Types.Bool, 0, nil, "arg2", "arg3"),
    27  			Goto("b3")),
    28  		Bloc("b3",
    29  			Valu("phi2", OpPhi, c.config.Types.Bool, 0, nil, "cmp1", "cmp2"),
    30  			If("phi2", "b4", "b5")),
    31  		Bloc("b4",
    32  			Valu("cmp3", OpLess64, c.config.Types.Bool, 0, nil, "arg3", "arg1"),
    33  			Goto("b5")),
    34  		Bloc("b5",
    35  			Valu("phi3", OpPhi, c.config.Types.Bool, 0, nil, "phi2", "cmp3"),
    36  			If("phi3", "b6", "b7")),
    37  		Bloc("b6",
    38  			Exit("mem")),
    39  		Bloc("b7",
    40  			Exit("mem")))
    41  
    42  	CheckFunc(fun.f)
    43  	shortcircuit(fun.f)
    44  	CheckFunc(fun.f)
    45  
    46  	for _, b := range fun.f.Blocks {
    47  		for _, v := range b.Values {
    48  			if v.Op == OpPhi {
    49  				t.Errorf("phi %s remains", v)
    50  			}
    51  		}
    52  	}
    53  }
    54
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