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
|
// run
// 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.
// Tests short circuiting.
package main
func and_ssa(arg1, arg2 bool) bool {
return arg1 && rightCall(arg2)
}
func or_ssa(arg1, arg2 bool) bool {
return arg1 || rightCall(arg2)
}
var rightCalled bool
//go:noinline
func rightCall(v bool) bool {
rightCalled = true
return v
panic("unreached")
}
func testAnd(arg1, arg2, wantRes bool) { testShortCircuit("AND", arg1, arg2, and_ssa, arg1, wantRes) }
func testOr(arg1, arg2, wantRes bool) { testShortCircuit("OR", arg1, arg2, or_ssa, !arg1, wantRes) }
func testShortCircuit(opName string, arg1, arg2 bool, fn func(bool, bool) bool, wantRightCall, wantRes bool) {
rightCalled = false
got := fn(arg1, arg2)
if rightCalled != wantRightCall {
println("failed for", arg1, opName, arg2, "; rightCalled=", rightCalled, "want=", wantRightCall)
failed = true
}
if wantRes != got {
println("failed for", arg1, opName, arg2, "; res=", got, "want=", wantRes)
failed = true
}
}
var failed = false
func main() {
testAnd(false, false, false)
testAnd(false, true, false)
testAnd(true, false, false)
testAnd(true, true, true)
testOr(false, false, false)
testOr(false, true, true)
testOr(true, false, true)
testOr(true, true, true)
if failed {
panic("failed")
}
}
|
