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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature
; RUN: opt < %s -S -passes=ipsccp | FileCheck %s
; testf() performs an unconditional branch on undef, as such the testf() return
; value used in test1() will remain "unknown" and the following branch on it
; replaced by unreachable. This is fine, as the call to testf() will already
; trigger undefined behavior.
define void @test1() {
; CHECK-LABEL: define {{[^@]+}}@test1() {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[CALL:%.*]] = call i1 @testf()
; CHECK-NEXT: unreachable
;
entry:
br label %if.then
if.then: ; preds = %entry, %if.then
%foo = phi i32 [ 0, %entry], [ %next, %if.then]
%next = add i32 %foo, 1
%call = call i1 @testf()
br i1 %call, label %if.end, label %if.then
if.end: ; preds = %if.then, %entry
ret void
}
define internal i1 @testf() {
; CHECK-LABEL: define {{[^@]+}}@testf() {
; CHECK-NEXT: entry:
; CHECK-NEXT: unreachable
;
entry:
br i1 undef, label %if.then1, label %if.end3
if.then1: ; preds = %if.end
br label %if.end3
if.end3: ; preds = %if.then1, %entry
ret i1 true
}
; Call sites in unreachable blocks should not be a problem.
define i1 @test2() {
; CHECK-LABEL: define {{[^@]+}}@test2() {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: [[CALL2:%.*]] = call i1 @testf()
; CHECK-NEXT: ret i1 undef
;
entry:
br label %if.end
if.then: ; preds = %entry, %if.then
%call = call i1 @testf()
br i1 %call, label %if.end, label %if.then
if.end: ; preds = %if.then, %entry
%call2 = call i1 @testf()
ret i1 %call2
}
|
