xref: /llvm-project/llvm/test/Transforms/InstCombine/bitcast-phi-uselistorder.ll (revision 4ab40eca080965c65802710e39adbb78c4ce7bde)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -passes=instcombine < %s | FileCheck %s
3
4@Q = internal unnamed_addr global double 1.000000e+00, align 8
5
6define double @test(i1 %c, ptr %p) {
7; CHECK-LABEL: @test(
8; CHECK-NEXT:  entry:
9; CHECK-NEXT:    br i1 [[C:%.*]], label [[IF:%.*]], label [[END:%.*]]
10; CHECK:       if:
11; CHECK-NEXT:    [[LOAD1:%.*]] = load double, ptr @Q, align 8
12; CHECK-NEXT:    br label [[END]]
13; CHECK:       end:
14; CHECK-NEXT:    [[TMP0:%.*]] = phi double [ 0.000000e+00, [[ENTRY:%.*]] ], [ [[LOAD1]], [[IF]] ]
15; CHECK-NEXT:    store double [[TMP0]], ptr [[P:%.*]], align 8
16; CHECK-NEXT:    ret double [[TMP0]]
17;
18entry:
19  br i1 %c, label %if, label %end
20
21if:
22  %load = load i64, ptr @Q, align 8
23  br label %end
24
25end:
26  %phi = phi i64 [ 0, %entry ], [ %load, %if ]
27  store i64 %phi, ptr %p, align 8
28  %cast = bitcast i64 %phi to double
29  ret double %cast
30
31  uselistorder i64 %phi, { 1, 0 }
32}
33