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150
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1 ; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s
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2 ;
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3 ; Verify that trunc i64 to i32 is considered free by loop unrolling
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4 ; heuristics when i32 is a native type.
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5 ; This should result in full unrolling this loop with size=7, TC=19.
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6 ; If the trunc were not free we would have 8*19=152 > 150.
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7
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8 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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9
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10 ; Check that for.body was unrolled 19 times.
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11 ; CHECK-LABEL: @test(
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12 ; CHECK: %0 = load
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13 ; CHECK: %conv = sext i8 %0 to i32
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14 ; CHECK: %add.1 = add nsw i32 %conv.1, %conv
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15 ; CHECK: %add.18 = add nsw i32 %conv.18, %add.17
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16 ; CHECK: ret i32 %add.18
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17 define i32 @test(i8* %arr) nounwind uwtable readnone {
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18 entry:
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19 br label %for.body
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20
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21 for.body: ; preds = %for.body, %entry
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22 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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23 %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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24 %arrayidx = getelementptr inbounds i8, i8* %arr, i64 %indvars.iv
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25 %0 = load i8, i8* %arrayidx, align 1
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26 %conv = sext i8 %0 to i32
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27 %add = add nsw i32 %conv, %sum.02
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28 %indvars.iv.next = add i64 %indvars.iv, 1
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29 %lftr.wideiv1 = trunc i64 %indvars.iv.next to i32
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30 %exitcond2 = icmp eq i32 %lftr.wideiv1, 19
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31 br i1 %exitcond2, label %for.end, label %for.body
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32
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33 for.end: ; preds = %for.body
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34 %add.lcssa = phi i32 [ %add, %for.body ]
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35 ret i32 %add.lcssa
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36 }
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