commit 9b2617a5a8d72a58a0de6d464d01abcc18d54fdc
author Hal Finkel <hfinkel@anl.gov> Sat Jan 25 17:32:39 2014 +0000
committer Hal Finkel <hfinkel@anl.gov> Sat Jan 25 17:32:39 2014 +0000
tree 6c400f3af6bcf3468e9c48c18aaceb35d5e5e9e5
parent 5fb07341f177dc9d73cb68a98c85bb9ab6ee62b6

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.

llvm-svn: 200088

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 72628ef..af7519a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -56,6 +56,13 @@
     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 @@
 
   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 @@
 
   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 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);