Index: llvm/trunk/lib/Analysis/DivergenceAnalysis.cpp
===================================================================
--- llvm/trunk/lib/Analysis/DivergenceAnalysis.cpp
+++ llvm/trunk/lib/Analysis/DivergenceAnalysis.cpp
@@ -77,6 +77,8 @@
 #include <vector>
 using namespace llvm;
 
+#define DEBUG_TYPE "divergence"
+
 namespace {
 
 class DivergencePropagator {
@@ -299,6 +301,10 @@
                           PDT, DivergentValues);
   DP.populateWithSourcesOfDivergence();
   DP.propagate();
+  LLVM_DEBUG(
+    dbgs() << "\nAfter divergence analysis on " << F.getName() << ":\n";
+    print(dbgs(), F.getParent())
+  );
   return false;
 }
 
@@ -318,12 +324,17 @@
 
   // Dumps all divergent values in F, arguments and then instructions.
   for (auto &Arg : F->args()) {
-    if (DivergentValues.count(&Arg))
-      OS << "DIVERGENT:  " << Arg << "\n";
+    OS << (DivergentValues.count(&Arg) ? "DIVERGENT: " : "           ");
+    OS << Arg << "\n";
   }
   // Iterate instructions using instructions() to ensure a deterministic order.
-  for (auto &I : instructions(F)) {
-    if (DivergentValues.count(&I))
-      OS << "DIVERGENT:" << I << "\n";
+  for (auto BI = F->begin(), BE = F->end(); BI != BE; ++BI) {
+    auto &BB = *BI;
+    OS << "\n           " << BB.getName() << ":\n";
+    for (auto &I : BB.instructionsWithoutDebug()) {
+      OS << (DivergentValues.count(&I) ? "DIVERGENT:     " : "               ");
+      OS << I << "\n";
+    }
   }
+  OS << "\n";
 }
Index: llvm/trunk/test/Analysis/DivergenceAnalysis/AMDGPU/phi-undef.ll
===================================================================
--- llvm/trunk/test/Analysis/DivergenceAnalysis/AMDGPU/phi-undef.ll
+++ llvm/trunk/test/Analysis/DivergenceAnalysis/AMDGPU/phi-undef.ll
@@ -2,9 +2,12 @@
 
 ; CHECK-LABEL: 'test1':
 ; CHECK-NEXT: DIVERGENT: i32 %bound
+; CHECK: {{^  *}}%counter =
 ; CHECK-NEXT: DIVERGENT: %break = icmp sge i32 %counter, %bound
 ; CHECK-NEXT: DIVERGENT: br i1 %break, label %footer, label %body
-; CHECK-NEXT: DIVERGENT: br i1 %break, label %end, label %header
+; CHECK: {{^  *}}%counter.next =
+; CHECK: {{^  *}}%counter.footer =
+; CHECK: DIVERGENT: br i1 %break, label %end, label %header
 ; Note: %counter is not divergent!
 define amdgpu_ps void @test1(i32 %bound) {
 entry: