[llvm] r200088 - Add combiner-aa-only-func (debug only)

[Hal Finkel]

Author: hfinkel
Date: Sat Jan 25 11:32:39 2014
New Revision: 200088

URL: http://llvm.org/viewvc/llvm-project?rev=200088&view=rev
Log:
Add combiner-aa-only-func (debug only)

This option (which is !NDEBUG only) allows restricting the use of alias
analysis in DAGCombiner to a specific function. This has proved extremely
valuable to isolating bugs related to this feature, and mirrors the
misched-only-func option provided by the new instruction scheduler.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=200088&r1=200087&r2=200088&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Sat Jan 25 11:32:39 2014
@@ -56,6 +56,13 @@ namespace {
     CombinerGlobalAA("combiner-global-alias-analysis", cl::Hidden,
                cl::desc("Enable DAG combiner's use of IR alias analysis"));
 
+#ifndef NDEBUG
+  static cl::opt<std::string>
+    CombinerAAOnlyFunc("combiner-aa-only-func", cl::Hidden,
+               cl::desc("Only use DAG-combiner alias analysis in this"
+                        " function"));
+#endif
+
   /// Hidden option to stress test load slicing, i.e., when this option
   /// is enabled, load slicing bypasses most of its profitability guards.
   static cl::opt<bool>
@@ -7729,6 +7736,11 @@ SDValue DAGCombiner::visitLOAD(SDNode *N
 
   bool UseAA = CombinerAA.getNumOccurrences() > 0 ? CombinerAA :
     TLI.getTargetMachine().getSubtarget<TargetSubtargetInfo>().useAA();
+#ifndef NDEBUG
+  if (CombinerAAOnlyFunc.getNumOccurrences() &&
+      CombinerAAOnlyFunc != DAG.getMachineFunction().getName())
+    UseAA = false;
+#endif
   if (UseAA && LD->isUnindexed()) {
     // Walk up chain skipping non-aliasing memory nodes.
     SDValue BetterChain = FindBetterChain(N, Chain);
@@ -9317,6 +9329,11 @@ SDValue DAGCombiner::visitSTORE(SDNode *
 
   bool UseAA = CombinerAA.getNumOccurrences() > 0 ? CombinerAA :
     TLI.getTargetMachine().getSubtarget<TargetSubtargetInfo>().useAA();
+#ifndef NDEBUG
+  if (CombinerAAOnlyFunc.getNumOccurrences() &&
+      CombinerAAOnlyFunc != DAG.getMachineFunction().getName())
+    UseAA = false;
+#endif
   if (UseAA && ST->isUnindexed()) {
     // Walk up chain skipping non-aliasing memory nodes.
     SDValue BetterChain = FindBetterChain(N, Chain);
@@ -11051,6 +11068,11 @@ bool DAGCombiner::isAlias(SDValue Ptr1,
 
   bool UseAA = CombinerGlobalAA.getNumOccurrences() > 0 ? CombinerGlobalAA :
     TLI.getTargetMachine().getSubtarget<TargetSubtargetInfo>().useAA();
+#ifndef NDEBUG
+  if (CombinerAAOnlyFunc.getNumOccurrences() &&
+      CombinerAAOnlyFunc != DAG.getMachineFunction().getName())
+    UseAA = false;
+#endif
   if (UseAA && SrcValue1 && SrcValue2) {
     // Use alias analysis information.
     int64_t MinOffset = std::min(SrcValueOffset1, SrcValueOffset2);