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annotate test/Transforms/InstCombine/narrow.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 803732b1fca8
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 ; This file contains various testcases that check to see that instcombine
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 ; is narrowing computations when possible.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 ; RUN: opt < %s -instcombine -S | \
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 ; RUN: grep "ret i1 false"
95c75e76d11b LLVM 3.4
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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6 ; test1 - Eliminating the casts in this testcase (by narrowing the AND
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 ; operation) allows instcombine to realize the function always returns false.
95c75e76d11b LLVM 3.4
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 i1 @test1(i32 %A, i32 %B) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 %C1 = icmp slt i32 %A, %B ; <i1> [#uses=1]
95c75e76d11b LLVM 3.4
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11 %ELIM1 = zext i1 %C1 to i32 ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
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12 %C2 = icmp sgt i32 %A, %B ; <i1> [#uses=1]
95c75e76d11b LLVM 3.4
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13 %ELIM2 = zext i1 %C2 to i32 ; <i32> [#uses=1]
95c75e76d11b LLVM 3.4
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14 %C3 = and i32 %ELIM1, %ELIM2 ; <i32> [#uses=1]
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15 %ELIM3 = trunc i32 %C3 to i1 ; <i1> [#uses=1]
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16 ret i1 %ELIM3
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17 }
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