1 files changed, 75 insertions, 0 deletions

diff --git a/test/Analysis/BasicAA/phi-loop.ll b/test/Analysis/BasicAA/phi-loop.ll
new file mode 100644
index 000000000000..6337bfbc1cfb
--- /dev/null
+++ b/test/Analysis/BasicAA/phi-loop.ll
@@ -0,0 +1,75 @@
+; RUN: opt < %s -basicaa -basicaa-recphi=1 -gvn -S | FileCheck %s
+;
+; Check that section->word_ofs doesn't get reloaded in every iteration of the
+; for loop.
+;
+; Code:
+;
+; typedef struct {
+;   unsigned num_words;
+;   unsigned word_ofs;
+;   const unsigned *data;
+; } section_t;
+; 
+; 
+; void test2(const section_t * restrict section, unsigned * restrict dst) {;
+;   while (section->data != NULL) {
+;     const unsigned *src = section->data;
+;     for (unsigned i=0; i < section->num_words; ++i) {
+;       dst[section->word_ofs + i] = src[i];
+;     }   
+; 
+;     ++section;
+;   }
+; }
+; 
+
+; CHECK-LABEL: for.body:
+; CHECK-NOT: load i32, i32* %word_ofs
+
+%struct.section_t = type { i32, i32, i32* }
+
+define void @test2(%struct.section_t* noalias nocapture readonly %section, i32* noalias nocapture %dst) {
+entry:
+  %data13 = getelementptr inbounds %struct.section_t, %struct.section_t* %section, i32 0, i32 2
+  %0 = load i32*, i32** %data13, align 4
+  %cmp14 = icmp eq i32* %0, null
+  br i1 %cmp14, label %while.end, label %for.cond.preheader
+
+for.cond.preheader:                               ; preds = %entry, %for.end
+  %1 = phi i32* [ %6, %for.end ], [ %0, %entry ]
+  %section.addr.015 = phi %struct.section_t* [ %incdec.ptr, %for.end ], [ %section, %entry ]
+  %num_words = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 0
+  %2 = load i32, i32* %num_words, align 4
+  %cmp211 = icmp eq i32 %2, 0
+  br i1 %cmp211, label %for.end, label %for.body.lr.ph
+
+for.body.lr.ph:                                   ; preds = %for.cond.preheader
+  %word_ofs = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 0, i32 1
+  br label %for.body
+
+for.body:                                         ; preds = %for.body.lr.ph, %for.body
+  %arrayidx.phi = phi i32* [ %1, %for.body.lr.ph ], [ %arrayidx.inc, %for.body ]
+  %i.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
+  %3 = load i32, i32* %arrayidx.phi, align 4
+  %4 = load i32, i32* %word_ofs, align 4
+  %add = add i32 %4, %i.012
+  %arrayidx3 = getelementptr inbounds i32, i32* %dst, i32 %add
+  store i32 %3, i32* %arrayidx3, align 4
+  %inc = add i32 %i.012, 1
+  %5 = load i32, i32* %num_words, align 4
+  %cmp2 = icmp ult i32 %inc, %5
+  %arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
+  br i1 %cmp2, label %for.body, label %for.end
+
+for.end:                                          ; preds = %for.body, %for.cond.preheader
+  %incdec.ptr = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1
+  %data = getelementptr inbounds %struct.section_t, %struct.section_t* %section.addr.015, i32 1, i32 2
+  %6 = load i32*, i32** %data, align 4
+  %cmp = icmp eq i32* %6, null
+  br i1 %cmp, label %while.end, label %for.cond.preheader
+
+while.end:                                        ; preds = %for.end, %entry
+  ret void
+}
+