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annotate test/Analysis/BasicAA/gcsetest.ll @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children
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60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
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1 ; Test that GCSE uses basicaa to do alias analysis, which is capable of
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
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2 ; disambiguating some obvious cases. All loads should be removable in
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3 ; this testcase.
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5 ; RUN: opt < %s -basicaa -gvn -instcombine -dce -S | FileCheck %s
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6
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7 @A = global i32 7
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8 @B = global i32 8
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9
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10 ; CHECK: define i32 @test()
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11 ; CHECK-NEXT: store i32 123, i32* @B
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12 ; CHECK-NEXT: ret i32 0
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14 define i32 @test() {
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afa8332a0e37 LLVM 3.8
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15 %A1 = load i32, i32* @A
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16
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17 store i32 123, i32* @B ; Store cannot alias @A
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19 %A2 = load i32, i32* @A
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20 %X = sub i32 %A1, %A2
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21 ret i32 %X
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22 }
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23
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24 ; CHECK: define i32 @test2()
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25 ; CHECK-NEXT: br label %Loop
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26 ; CHECK: Loop:
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27 ; CHECK-NEXT: store i32 0, i32* @B
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28 ; CHECK-NEXT: br i1 true, label %out, label %Loop
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29 ; CHECK: out:
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30 ; CHECK-NEXT: ret i32 0
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32 define i32 @test2() {
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33 %A1 = load i32, i32* @A
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34 br label %Loop
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35 Loop:
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36 %AP = phi i32 [0, %0], [%X, %Loop]
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37 store i32 %AP, i32* @B ; Store cannot alias @A
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39 %A2 = load i32, i32* @A
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40 %X = sub i32 %A1, %A2
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41 %c = icmp eq i32 %X, 0
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42 br i1 %c, label %out, label %Loop
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43
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44 out:
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45 ret i32 %X
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46 }
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47
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48 declare void @external()
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49
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50 ; CHECK: define i32 @test3()
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51 ; CHECK-NEXT: call void @external()
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52 ; CHECK-NEXT: ret i32 7
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53
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54 define i32 @test3() {
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55 %X = alloca i32
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56 store i32 7, i32* %X
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57 call void @external()
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58 %V = load i32, i32* %X
0
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59 ret i32 %V
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60 }
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