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150
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1 ; RUN: opt < %s -S -loop-unroll -unroll-threshold=50 | FileCheck %s
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2
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3 ; Make sure this loop is completely unrolled...
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4 ; CHECK-LABEL: @test1
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5 ; CHECK: for.body:
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6 ; CHECK-NOT: for.end:
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7
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8 define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
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9 entry:
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10 br label %for.body
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11
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12 for.body: ; preds = %for.body, %entry
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13 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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14 %sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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15 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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16 %0 = load i32, i32* %arrayidx, align 4
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17
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18 ; This loop will be completely unrolled, even with these extra instructions,
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19 ; but only because they're ephemeral (and, thus, free).
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20 %1 = add nsw i32 %0, 2
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21 %2 = add nsw i32 %1, 4
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22 %3 = add nsw i32 %2, 4
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23 %4 = add nsw i32 %3, 4
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24 %5 = add nsw i32 %4, 4
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25 %6 = add nsw i32 %5, 4
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26 %7 = add nsw i32 %6, 4
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27 %8 = add nsw i32 %7, 4
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28 %9 = add nsw i32 %8, 4
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29 %10 = add nsw i32 %9, 4
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30 %ca = icmp sgt i32 %10, -7
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31 call void @llvm.assume(i1 %ca)
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32
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33 %add = add nsw i32 %0, %sum.01
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34 %indvars.iv.next = add i64 %indvars.iv, 1
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35 %lftr.wideiv = trunc i64 %indvars.iv.next to i32
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36 %exitcond = icmp eq i32 %lftr.wideiv, 5
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37 br i1 %exitcond, label %for.end, label %for.body
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38
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39 for.end: ; preds = %for.body
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40 ret i32 %add
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41 }
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42
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43 declare void @llvm.assume(i1) nounwind
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44
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