1 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=16 | FileCheck --check-prefix=UNROLL-16 %s 2 ; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=4 | FileCheck --check-prefix=UNROLL-4 %s 3 4 ; Given that the trip-count of this loop is a 3-bit value, we cannot 5 ; safely unroll it with a count of anything more than 8. 6 7 define i3 @test(i3* %a, i3 %n) { 8 ; UNROLL-16-LABEL: @test( 9 ; UNROLL-4-LABEL: @test( 10 entry: 11 %cmp1 = icmp eq i3 %n, 0 12 br i1 %cmp1, label %for.end, label %for.body 13 14 for.body: ; preds = %for.body, %entry 15 ; UNROLL-16-LABEL: for.body: 16 ; UNROLL-4-LABEL: for.body: 17 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ] 18 %sum.02 = phi i3 [ %add, %for.body ], [ 0, %entry ] 19 %arrayidx = getelementptr inbounds i3, i3* %a, i64 %indvars.iv 20 21 ; UNROLL-16-LABEL: for.body 22 ; UNROLL-16-LABEL: getelementptr 23 ; UNROLL-16-LABEL-NOT: getelementptr 24 25 ; UNROLL-4-LABEL: getelementptr 26 ; UNROLL-4-LABEL: getelementptr 27 ; UNROLL-4-LABEL: getelementptr 28 ; UNROLL-4-LABEL: getelementptr 29 30 %0 = load i3, i3* %arrayidx 31 %add = add nsw i3 %0, %sum.02 32 %indvars.iv.next = add i64 %indvars.iv, 1 33 %lftr.wideiv = trunc i64 %indvars.iv.next to i3 34 %exitcond = icmp eq i3 %lftr.wideiv, %n 35 br i1 %exitcond, label %for.end, label %for.body 36 37 ; UNROLL-16-LABEL: for.end 38 ; UNROLL-4-LABEL: for.end 39 40 ; UNROLL-16-NOT: for.body.epil: 41 ; UNROLL-4: for.body.epil: 42 43 for.end: ; preds = %for.body, %entry 44 %sum.0.lcssa = phi i3 [ 0, %entry ], [ %add, %for.body ] 45 ret i3 %sum.0.lcssa 46 } 47
