1; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=true  -unroll-count=8 | FileCheck %s  -check-prefix=EPILOG
2; RUN: opt < %s -S -loop-unroll -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
3
4; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=true  -unroll-count=8 | FileCheck %s  -check-prefix=EPILOG
5; RUN: opt < %s -S -passes='require<opt-remark-emit>,unroll' -unroll-threshold=25 -unroll-partial-threshold=25 -unroll-runtime -unroll-runtime-epilog=false | FileCheck %s -check-prefix=PROLOG
6
7; Choose a smaller, power-of-two, unroll count if the loop is too large.
8; This test makes sure we're not unrolling 'odd' counts
9
10; EPILOG: for.body:
11; EPILOG: br i1 %niter.ncmp.3, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
12; EPILOG-NOT: br i1 %niter.ncmp.4, label %for.end.loopexit.unr-lcssa.loopexit{{.*}}, label %for.body
13; EPILOG: for.body.epil:
14
15; PROLOG: for.body.prol:
16; PROLOG: for.body:
17; PROLOG: br i1 %exitcond.3, label %for.end.loopexit{{.*}}, label %for.body
18; PROLOG-NOT: br i1 %exitcond.4, label %for.end.loopexit{{.*}}, label %for.body
19
20define i32 @test(i32* nocapture %a, i32 %n) nounwind uwtable readonly {
21entry:
22  %cmp1 = icmp eq i32 %n, 0
23  br i1 %cmp1, label %for.end, label %for.body
24
25for.body:                                         ; preds = %for.body, %entry
26  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
27  %sum.02 = phi i32 [ %add, %for.body ], [ 0, %entry ]
28  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
29  %0 = load i32, i32* %arrayidx, align 4
30  %add = add nsw i32 %0, %sum.02
31  %indvars.iv.next = add i64 %indvars.iv, 1
32  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
33  %exitcond = icmp eq i32 %lftr.wideiv, %n
34  br i1 %exitcond, label %for.end, label %for.body
35
36for.end:                                          ; preds = %for.body, %entry
37  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.body ]
38  ret i32 %sum.0.lcssa
39}
40