xref: /llvm-project/llvm/test/Transforms/SCCP/phi-cycle.ll (revision 8ebb3eac02a926ffa4298c12834c57aefb2e8579)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=ipsccp -S %s | FileCheck %s
3
4declare i1 @cond()
5
6define i32 @test() {
7; CHECK-LABEL: @test(
8; CHECK-NEXT:  entry:
9; CHECK-NEXT:    br label [[LOOP:%.*]]
10; CHECK:       loop:
11; CHECK-NEXT:    [[C_1:%.*]] = call i1 @cond()
12; CHECK-NEXT:    br i1 [[C_1]], label [[LOOP]], label [[LATCH_2:%.*]]
13; CHECK:       latch.2:
14; CHECK-NEXT:    [[C_2:%.*]] = call i1 @cond()
15; CHECK-NEXT:    br i1 [[C_2]], label [[LOOP]], label [[EXIT:%.*]]
16; CHECK:       exit:
17; CHECK-NEXT:    ret i32 0
18;
19entry:
20  br label %loop
21
22loop:
23  %p = phi i32 [ undef, %entry ], [ 0, %latch.2 ], [ %p, %loop]
24  %c.1 = call i1 @cond()
25  br i1 %c.1, label %loop, label %latch.2
26
27latch.2:
28  %c.2 = call i1 @cond()
29  br i1 %c.2, label %loop, label %exit
30
31exit:
32  ret i32 %p
33}
34