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