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annotate llvm/test/Transforms/IndVarSimplify/tripcount_infinite.ll @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children 2e18cbf3894f
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150
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1 ; These tests have an infinite trip count. We obviously shouldn't remove the
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2 ; loops! :)
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3 ;
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4 ; RUN: opt < %s -indvars -adce -simplifycfg -S | FileCheck %s
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5
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6 ;; test for (i = 1; i != 100; i += 2)
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7 define i32 @infinite_linear() {
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8 ; CHECK-LABEL: @infinite_linear(
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9 entry:
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10 br label %loop
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11
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12 loop: ; preds = %loop, %entry
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13 ; CHECK-LABEL: loop:
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14 %i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=3]
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15 %i.next = add i32 %i, 2 ; <i32> [#uses=1]
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16 %c = icmp ne i32 %i, 100 ; <i1> [#uses=1]
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17 ; CHECK: icmp
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18 ; CHECK: br
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19 br i1 %c, label %loop, label %loopexit
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20
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21 loopexit: ; preds = %loop
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22 ; CHECK-LABEL: loopexit:
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23 ret i32 %i
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24 }
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25
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26 ;; test for (i = 1; i*i != 63; ++i)
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27 define i32 @infinite_quadratic() {
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28 ; CHECK-LABEL: @infinite_quadratic(
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29 entry:
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30 br label %loop
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31
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32 loop: ; preds = %loop, %entry
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33 ; CHECK-LABEL: loop:
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34 %i = phi i32 [ 1, %entry ], [ %i.next, %loop ] ; <i32> [#uses=4]
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35 %isquare = mul i32 %i, %i ; <i32> [#uses=1]
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36 %i.next = add i32 %i, 1 ; <i32> [#uses=1]
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37 %c = icmp ne i32 %isquare, 63 ; <i1> [#uses=1]
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38 ; CHECK: icmp
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39 ; CHECK: br
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40 br i1 %c, label %loop, label %loopexit
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41
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42 loopexit: ; preds = %loop
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43 ; CHECK-LABEL: loopexit:
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44 ret i32 %i
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45 }