1;RUN: opt -S %s -indvars | FileCheck %s
2
3; CHECK-LABEL: @foo(
4; CHECK-NOT: %lftr.wideiv = trunc i32 %indvars.iv.next to i16
5; CHECK: %exitcond = icmp ne i32 %indvars.iv.next, 512
6define void @foo() #0 {
7entry:
8  br label %for.body
9
10for.body:                                         ; preds = %entry, %for.body
11  %i.01 = phi i16 [ 0, %entry ], [ %inc, %for.body ]
12  %conv2 = sext i16 %i.01 to i32
13  call void @bar(i32 %conv2) #1
14  %inc = add i16 %i.01, 1
15  %cmp = icmp slt i16 %inc, 512
16  br i1 %cmp, label %for.body, label %for.end
17
18for.end:                                          ; preds = %for.body
19  ret void
20}
21
22; Check that post-incrementing the backedge taken count does not overflow.
23; CHECK-LABEL: @postinc(
24; CHECK: icmp eq i32 %indvars.iv, 255
25define i32 @postinc() #0 {
26entry:
27  br label %do.body
28
29do.body:                                          ; preds = %do.body, %entry
30  %first.0 = phi i8 [ 0, %entry ], [ %inc, %do.body ]
31  %conv = zext i8 %first.0 to i32
32  call void  @bar(i32 %conv) #1
33  %inc = add i8 %first.0, 1
34  %cmp = icmp eq i8 %first.0, -1
35  br i1 %cmp, label %do.end, label %do.body
36
37do.end:                                           ; preds = %do.body
38  ret i32 0
39}
40
41declare void @bar(i32)
42
43attributes #0 = { nounwind uwtable }
44attributes #1 = { nounwind }
45