1; RUN: opt -analyze -scalar-evolution < %s | FileCheck %s
2
3; ScalarEvolution should be able to use nsw information to prove that
4; this loop has a finite trip count.
5
6; CHECK: @le
7; CHECK: Loop %for.body: backedge-taken count is %n
8; CHECK: Loop %for.body: max backedge-taken count is 9223372036854775807
9
10define void @le(i64 %n, double* nocapture %p) nounwind {
11entry:
12  %cmp6 = icmp slt i64 %n, 0                      ; <i1> [#uses=1]
13  br i1 %cmp6, label %for.end, label %for.body
14
15for.body:                                         ; preds = %for.body, %entry
16  %i = phi i64 [ %i.next, %for.body ], [ 0, %entry ] ; <i64> [#uses=2]
17  %arrayidx = getelementptr double* %p, i64 %i    ; <double*> [#uses=2]
18  %t4 = load double* %arrayidx                    ; <double> [#uses=1]
19  %mul = fmul double %t4, 2.200000e+00            ; <double> [#uses=1]
20  store double %mul, double* %arrayidx
21  %i.next = add nsw i64 %i, 1                     ; <i64> [#uses=2]
22  %cmp = icmp sgt i64 %i.next, %n                 ; <i1> [#uses=1]
23  br i1 %cmp, label %for.end, label %for.body
24
25for.end:                                          ; preds = %for.body, %entry
26  ret void
27}
28