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150
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1 ; RUN: opt < %s -indvars -instcombine -S | FileCheck %s
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2 ;
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3 ; Test that -indvars can reduce variable stride IVs. If it can reduce variable
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4 ; stride iv's, it will make %iv. and %m.0.0 isomorphic to each other without
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5 ; cycles, allowing the tmp.21 subtraction to be eliminated.
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6
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7 define void @vnum_test8(i32* %data) {
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8 entry:
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9 %tmp.1 = getelementptr i32, i32* %data, i32 3 ; <i32*> [#uses=1]
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10 %tmp.2 = load i32, i32* %tmp.1 ; <i32> [#uses=2]
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11 %tmp.4 = getelementptr i32, i32* %data, i32 4 ; <i32*> [#uses=1]
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12 %tmp.5 = load i32, i32* %tmp.4 ; <i32> [#uses=2]
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13 %tmp.8 = getelementptr i32, i32* %data, i32 2 ; <i32*> [#uses=1]
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14 %tmp.9 = load i32, i32* %tmp.8 ; <i32> [#uses=3]
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15 %tmp.125 = icmp sgt i32 %tmp.2, 0 ; <i1> [#uses=1]
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16 br i1 %tmp.125, label %no_exit.preheader, label %return
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17
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18 no_exit.preheader: ; preds = %entry
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19 %tmp.16 = getelementptr i32, i32* %data, i32 %tmp.9 ; <i32*> [#uses=1]
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20 br label %no_exit
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21
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22 ; CHECK: store i32 0
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23 no_exit: ; preds = %no_exit, %no_exit.preheader
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24 %iv.ui = phi i32 [ 0, %no_exit.preheader ], [ %iv..inc.ui, %no_exit ] ; <i32> [#uses=1]
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25 %iv. = phi i32 [ %tmp.5, %no_exit.preheader ], [ %iv..inc, %no_exit ] ; <i32> [#uses=2]
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26 %m.0.0 = phi i32 [ %tmp.5, %no_exit.preheader ], [ %tmp.24, %no_exit ] ; <i32> [#uses=2]
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27 store i32 2, i32* %tmp.16
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28 %tmp.21 = sub i32 %m.0.0, %iv. ; <i32> [#uses=1]
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29 store i32 %tmp.21, i32* %data
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30 %tmp.24 = add i32 %m.0.0, %tmp.9 ; <i32> [#uses=1]
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31 %iv..inc = add i32 %tmp.9, %iv. ; <i32> [#uses=1]
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32 %iv..inc.ui = add i32 %iv.ui, 1 ; <i32> [#uses=2]
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33 %iv..inc1 = bitcast i32 %iv..inc.ui to i32 ; <i32> [#uses=1]
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34 %tmp.12 = icmp slt i32 %iv..inc1, %tmp.2 ; <i1> [#uses=1]
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35 br i1 %tmp.12, label %no_exit, label %return.loopexit
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36
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37 return.loopexit: ; preds = %no_exit
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38 br label %return
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39
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40 return: ; preds = %return.loopexit, %entry
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41 ret void
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42 }
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43
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