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annotate test/Analysis/BasicAA/store-promote.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 95c75e76d11b
children
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95c75e76d11b LLVM 3.4
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1 ; Test that LICM uses basicaa to do alias analysis, which is capable of
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2 ; disambiguating some obvious cases. If LICM is able to disambiguate the
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3 ; two pointers, then the load should be hoisted, and the store sunk.
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5 ; RUN: opt < %s -basicaa -licm -S | FileCheck %s
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6 target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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8 @A = global i32 7 ; <i32*> [#uses=3]
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9 @B = global i32 8 ; <i32*> [#uses=2]
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10 @C = global [2 x i32] [ i32 4, i32 8 ] ; <[2 x i32]*> [#uses=2]
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12 define i32 @test1(i1 %c) {
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13 %Atmp = load i32, i32* @A ; <i32> [#uses=2]
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14 br label %Loop
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16 Loop: ; preds = %Loop, %0
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17 %ToRemove = load i32, i32* @A ; <i32> [#uses=1]
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18 store i32 %Atmp, i32* @B
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19 br i1 %c, label %Out, label %Loop
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20
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21 Out: ; preds = %Loop
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22 %X = sub i32 %ToRemove, %Atmp ; <i32> [#uses=1]
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23 ret i32 %X
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25 ; The Loop block should be empty after the load/store are promoted.
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26 ; CHECK: @test1
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27 ; CHECK: load i32, i32* @A
0
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28 ; CHECK: Loop:
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29 ; CHECK-NEXT: br i1 %c, label %Out, label %Loop
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30 ; CHECK: Out:
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31 ; CHECK: store i32 %Atmp, i32* @B
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32 }
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33
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34 define i32 @test2(i1 %c) {
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35 br label %Loop
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36
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37 Loop: ; preds = %Loop, %0
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38 %AVal = load i32, i32* @A ; <i32> [#uses=2]
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39 %C0 = getelementptr [2 x i32], [2 x i32]* @C, i64 0, i64 0 ; <i32*> [#uses=1]
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40 store i32 %AVal, i32* %C0
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41 %BVal = load i32, i32* @B ; <i32> [#uses=2]
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42 %C1 = getelementptr [2 x i32], [2 x i32]* @C, i64 0, i64 1 ; <i32*> [#uses=1]
0
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43 store i32 %BVal, i32* %C1
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44 br i1 %c, label %Out, label %Loop
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45
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46 Out: ; preds = %Loop
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47 %X = sub i32 %AVal, %BVal ; <i32> [#uses=1]
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48 ret i32 %X
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49 ; The Loop block should be empty after the load/store are promoted.
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50 ; CHECK: @test2
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51 ; CHECK: Loop:
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52 ; CHECK-NEXT: br i1 %c, label %Out, label %Loop
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53 }
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54