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annotate test/Analysis/GlobalsModRef/purecse.ll @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children afa8332a0e37
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 ; Test that pure functions are cse'd away
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 ; RUN: opt < %s -globalsmodref-aa -gvn -instcombine -S | FileCheck %s
95c75e76d11b LLVM 3.4
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3
95c75e76d11b LLVM 3.4
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4 define i32 @pure(i32 %X) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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5 %Y = add i32 %X, 1 ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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6 ret i32 %Y
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7 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9 define i32 @test1(i32 %X) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 ; CHECK: %A = call i32 @pure(i32 %X)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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11 ; CHECK-NEXT: ret i32 0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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12 %A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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13 %B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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14 %C = sub i32 %A, %B ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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15 ret i32 %C
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16 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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17
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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18 define i32 @test2(i32 %X, i32* %P) {
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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19 ; CHECK: %A = call i32 @pure(i32 %X)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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20 ; CHECK-NEXT: store i32 %X, i32* %P
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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21 ; CHECK-NEXT: ret i32 0
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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22 %A = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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23 store i32 %X, i32* %P ;; Does not invalidate 'pure' call.
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24 %B = call i32 @pure( i32 %X ) ; <i32> [#uses=1]
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25 %C = sub i32 %A, %B ; <i32> [#uses=1]
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26 ret i32 %C
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27 }