1; REQUIRES: asserts
2; RUN: opt < %s -disable-output -stats -loop-unroll -unroll-runtime -unroll-partial-threshold=200 -unroll-threshold=400 -info-output-file - | FileCheck %s --check-prefix=STATS
3; RUN: opt < %s -disable-output -stats -passes='require<opt-remark-emit>,loop-unroll' -unroll-runtime -unroll-partial-threshold=200 -unroll-threshold=400 -info-output-file - | FileCheck %s --check-prefix=STATS
4
5; Test that nested loops can be unrolled.  We need to increase threshold to do it
6
7; STATS: 2 loop-unroll - Number of loops unrolled (completely or otherwise)
8
9define i32 @nested(i32* nocapture %a, i32 %n, i32 %m) nounwind uwtable readonly {
10entry:
11  %cmp11 = icmp sgt i32 %n, 0
12  br i1 %cmp11, label %for.cond1.preheader.lr.ph, label %for.end7
13
14for.cond1.preheader.lr.ph:                        ; preds = %entry
15  %cmp28 = icmp sgt i32 %m, 0
16  br label %for.cond1.preheader
17
18for.cond1.preheader:                              ; preds = %for.inc5, %for.cond1.preheader.lr.ph
19  %indvars.iv16 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next17, %for.inc5 ]
20  %sum.012 = phi i32 [ 0, %for.cond1.preheader.lr.ph ], [ %sum.1.lcssa, %for.inc5 ]
21  br i1 %cmp28, label %for.body3, label %for.inc5
22
23for.body3:                                        ; preds = %for.cond1.preheader, %for.body3
24  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body3 ], [ 0, %for.cond1.preheader ]
25  %sum.19 = phi i32 [ %add4, %for.body3 ], [ %sum.012, %for.cond1.preheader ]
26  %0 = add nsw i64 %indvars.iv, %indvars.iv16
27  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %0
28  %1 = load i32, i32* %arrayidx, align 4
29  %add4 = add nsw i32 %1, %sum.19
30  %indvars.iv.next = add i64 %indvars.iv, 1
31  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
32  %exitcond = icmp eq i32 %lftr.wideiv, %m
33  br i1 %exitcond, label %for.inc5, label %for.body3
34
35for.inc5:                                         ; preds = %for.body3, %for.cond1.preheader
36  %sum.1.lcssa = phi i32 [ %sum.012, %for.cond1.preheader ], [ %add4, %for.body3 ]
37  %indvars.iv.next17 = add i64 %indvars.iv16, 1
38  %lftr.wideiv18 = trunc i64 %indvars.iv.next17 to i32
39  %exitcond19 = icmp eq i32 %lftr.wideiv18, %n
40  br i1 %exitcond19, label %for.end7, label %for.cond1.preheader
41
42for.end7:                                         ; preds = %for.inc5, %entry
43  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1.lcssa, %for.inc5 ]
44  ret i32 %sum.0.lcssa
45}
46
47