76 lines
2.8 KiB
LLVM
76 lines
2.8 KiB
LLVM
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; RUN: opt < %s -basic-aa -gvn -S | FileCheck %s
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;
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; Check that section->word_ofs doesn't get reloaded in every iteration of the
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; for loop.
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;
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; Code:
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;
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; typedef struct {
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; unsigned num_words;
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; unsigned word_ofs;
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; const unsigned *data;
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; } section_t;
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;
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;
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; void test2(const section_t * restrict section, unsigned * restrict dst) {;
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; while (section->data != NULL) {
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; const unsigned *src = section->data;
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; for (unsigned i=0; i < section->num_words; ++i) {
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; dst[section->word_ofs + i] = src[i];
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; }
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;
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; ++section;
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; }
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; }
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;
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; CHECK-LABEL: for.body:
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; CHECK-NOT: load i32, i32* %word_ofs
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%struct.section_t = type { i32, i32, i32* }
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define void @test2(%struct.section_t* noalias nocapture readonly %section, i32* noalias nocapture %dst) {
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entry:
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%data13 = getelementptr inbounds %struct.section_t, %struct.section_t* %section, i32 0, i32 2
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%0 = load i32*, i32** %data13, align 4
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%cmp14 = icmp eq i32* %0, null
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br i1 %cmp14, label %while.end, label %for.cond.preheader
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for.cond.preheader: ; preds = %entry, %for.end
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%1 = phi i32* [ %6, %for.end ], [ %0, %entry ]
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%section.addr.015 = phi %struct.section_t* [ %incdec.ptr, %for.end ], [ %section, %entry ]
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%num_words = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 0
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%2 = load i32, i32* %num_words, align 4
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%cmp211 = icmp eq i32 %2, 0
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br i1 %cmp211, label %for.end, label %for.body.lr.ph
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for.body.lr.ph: ; preds = %for.cond.preheader
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%word_ofs = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 1
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br label %for.body
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for.body: ; preds = %for.body.lr.ph, %for.body
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%arrayidx.phi = phi i32* [ %1, %for.body.lr.ph ], [ %arrayidx.inc, %for.body ]
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%i.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%3 = load i32, i32* %arrayidx.phi, align 4
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%4 = load i32, i32* %word_ofs, align 4
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%add = add i32 %4, %i.012
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%arrayidx3 = getelementptr inbounds i32, i32* %dst, i32 %add
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store i32 %3, i32* %arrayidx3, align 4
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%inc = add i32 %i.012, 1
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%5 = load i32, i32* %num_words, align 4
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%cmp2 = icmp ult i32 %inc, %5
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%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
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br i1 %cmp2, label %for.body, label %for.end
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for.end: ; preds = %for.body, %for.cond.preheader
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%incdec.ptr = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1
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%data = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1, i32 2
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%6 = load i32*, i32** %data, align 4
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%cmp = icmp eq i32* %6, null
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br i1 %cmp, label %while.end, label %for.cond.preheader
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while.end: ; preds = %for.end, %entry
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ret void
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}
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