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