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e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | // Copyright 2015 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.
// Test control flow
package main
import "testing"
// nor_ssa calculates NOR(a, b).
// It is implemented in a way that generates
// phi control values.
func nor_ssa(a, b bool) bool {
var c bool
if a {
c = true
}
if b {
c = true
}
if c {
return false
}
return true
}
func testPhiControl(t *testing.T) {
tests := [...][3]bool{ // a, b, want
{false, false, true},
{true, false, false},
{false, true, false},
{true, true, false},
}
for _, test := range tests {
a, b := test[0], test[1]
got := nor_ssa(a, b)
want := test[2]
if want != got {
t.Errorf("nor(%t, %t)=%t got %t", a, b, want, got)
}
}
}
func emptyRange_ssa(b []byte) bool {
for _, x := range b {
_ = x
}
return true
}
func testEmptyRange(t *testing.T) {
if !emptyRange_ssa([]byte{}) {
t.Errorf("emptyRange_ssa([]byte{})=false, want true")
}
}
func switch_ssa(a int) int {
ret := 0
switch a {
case 5:
ret += 5
case 4:
ret += 4
case 3:
ret += 3
case 2:
ret += 2
case 1:
ret += 1
}
return ret
}
func fallthrough_ssa(a int) int {
ret := 0
switch a {
case 5:
ret++
fallthrough
case 4:
ret++
fallthrough
case 3:
ret++
fallthrough
case 2:
ret++
fallthrough
case 1:
ret++
}
return ret
}
func testFallthrough(t *testing.T) {
for i := 0; i < 6; i++ {
if got := fallthrough_ssa(i); got != i {
t.Errorf("fallthrough_ssa(i) = %d, wanted %d", got, i)
}
}
}
func testSwitch(t *testing.T) {
for i := 0; i < 6; i++ {
if got := switch_ssa(i); got != i {
t.Errorf("switch_ssa(i) = %d, wanted %d", got, i)
}
}
}
type junk struct {
step int
}
// flagOverwrite_ssa is intended to reproduce an issue seen where a XOR
// was scheduled between a compare and branch, clearing flags.
//
//go:noinline
func flagOverwrite_ssa(s *junk, c int) int {
if '0' <= c && c <= '9' {
s.step = 0
return 1
}
if c == 'e' || c == 'E' {
s.step = 0
return 2
}
s.step = 0
return 3
}
func testFlagOverwrite(t *testing.T) {
j := junk{}
if got := flagOverwrite_ssa(&j, ' '); got != 3 {
t.Errorf("flagOverwrite_ssa = %d, wanted 3", got)
}
}
func TestCtl(t *testing.T) {
testPhiControl(t)
testEmptyRange(t)
testSwitch(t)
testFallthrough(t)
testFlagOverwrite(t)
}
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