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annotate test/Analysis/BasicAA/phi-loop.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
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1 ; RUN: opt < %s -basicaa -basicaa-recphi=1 -gvn -S | FileCheck %s
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2 ;
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3 ; Check that section->word_ofs doesn't get reloaded in every iteration of the
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4 ; for loop.
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5 ;
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6 ; Code:
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7 ;
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8 ; typedef struct {
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9 ; unsigned num_words;
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10 ; unsigned word_ofs;
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11 ; const unsigned *data;
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12 ; } section_t;
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13 ;
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14 ;
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15 ; void test2(const section_t * restrict section, unsigned * restrict dst) {;
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16 ; while (section->data != NULL) {
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17 ; const unsigned *src = section->data;
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18 ; for (unsigned i=0; i < section->num_words; ++i) {
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19 ; dst[section->word_ofs + i] = src[i];
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20 ; }
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21 ;
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22 ; ++section;
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23 ; }
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24 ; }
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25 ;
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26
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27 ; CHECK-LABEL: for.body:
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28 ; CHECK-NOT: load i32, i32* %word_ofs
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29
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30 %struct.section_t = type { i32, i32, i32* }
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31
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32 define void @test2(%struct.section_t* noalias nocapture readonly %section, i32* noalias nocapture %dst) {
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33 entry:
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34 %data13 = getelementptr inbounds %struct.section_t, %struct.section_t* %section, i32 0, i32 2
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35 %0 = load i32*, i32** %data13, align 4
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36 %cmp14 = icmp eq i32* %0, null
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37 br i1 %cmp14, label %while.end, label %for.cond.preheader
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38
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39 for.cond.preheader: ; preds = %entry, %for.end
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40 %1 = phi i32* [ %6, %for.end ], [ %0, %entry ]
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41 %section.addr.015 = phi %struct.section_t* [ %incdec.ptr, %for.end ], [ %section, %entry ]
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42 %num_words = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 0
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43 %2 = load i32, i32* %num_words, align 4
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44 %cmp211 = icmp eq i32 %2, 0
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45 br i1 %cmp211, label %for.end, label %for.body.lr.ph
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46
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47 for.body.lr.ph: ; preds = %for.cond.preheader
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48 %word_ofs = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 1
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49 br label %for.body
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50
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51 for.body: ; preds = %for.body.lr.ph, %for.body
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52 %arrayidx.phi = phi i32* [ %1, %for.body.lr.ph ], [ %arrayidx.inc, %for.body ]
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53 %i.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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54 %3 = load i32, i32* %arrayidx.phi, align 4
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55 %4 = load i32, i32* %word_ofs, align 4
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56 %add = add i32 %4, %i.012
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57 %arrayidx3 = getelementptr inbounds i32, i32* %dst, i32 %add
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58 store i32 %3, i32* %arrayidx3, align 4
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59 %inc = add i32 %i.012, 1
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60 %5 = load i32, i32* %num_words, align 4
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61 %cmp2 = icmp ult i32 %inc, %5
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62 %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
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63 br i1 %cmp2, label %for.body, label %for.end
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64
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65 for.end: ; preds = %for.body, %for.cond.preheader
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66 %incdec.ptr = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1
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67 %data = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1, i32 2
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68 %6 = load i32*, i32** %data, align 4
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69 %cmp = icmp eq i32* %6, null
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70 br i1 %cmp, label %while.end, label %for.cond.preheader
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71
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72 while.end: ; preds = %for.end, %entry
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73 ret void
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74 }
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75