1; RUN: opt < %s -inline -instcombine -S | FileCheck %s
2
3; This test case exposed a bug in instcombine where the early
4; DCE of a call wasn't recognized as changing the IR.
5; So when runOnFunction propagated the "made changes" upwards
6; to the CallGraphSCCPass it signalled that no changes had been
7; made, so CallGraphSCCPass assumed that the old CallGraph,
8; as known by that pass manager, still was up-to-date.
9;
10; This was detected as an assert when trying to remove the
11; no longer used function 'bar' (due to incorrect reference
12; count in the CallGraph).
13
14define void @foo() {
15; CHECK-LABEL: @foo(
16; CHECK-NEXT:  entry:
17; CHECK-NEXT:    ret void
18;
19entry:
20  %call = call i32 @bar()
21  ret void
22}
23
24define internal i32 @bar() {
25; CHECK-NOT: bar
26entry:
27  ret i32 42
28}
29
30