1; RUN: opt < %s -loop-reduce -S -mtriple=x86_64-unknown-unknown | FileCheck %s
2;
3; Test LSR's OptimizeShadowIV. Handle a floating-point IV with a
4; nonzero initial value.
5; rdar://9786536
6
7; Provide legal integer types.
8target datalayout = "n8:16:32:64"
9
10
11; First, make sure LSR doesn't crash on an empty IVUsers list.
12; CHECK-LABEL: @dummyIV(
13; CHECK-NOT: phi
14; CHECK-NOT: sitofp
15; CHECK: br
16define void @dummyIV() nounwind {
17entry:
18  br label %loop
19
20loop:
21  %i.01 = phi i32 [ -39, %entry ], [ %inc, %loop ]
22  %conv = sitofp i32 %i.01 to double
23  %inc = add nsw i32 %i.01, 1
24  br i1 undef, label %loop, label %for.end
25
26for.end:
27  unreachable
28}
29
30; Now check that the computed double constant is correct.
31; CHECK-LABEL: @doubleIV(
32; CHECK: phi double [ -3.900000e+01, %entry ]
33; CHECK: br
34define void @doubleIV() nounwind {
35entry:
36  br label %loop
37
38loop:
39  %i.01 = phi i32 [ -39, %entry ], [ %inc, %loop ]
40  %conv = sitofp i32 %i.01 to double
41  %div = fdiv double %conv, 4.000000e+01
42  %inc = add nsw i32 %i.01, 1
43  br i1 undef, label %loop, label %for.end
44
45for.end:
46  unreachable
47}
48