[PATCH] D94469: [Statepoint Lowering] Add an option to allow use gc values in regs for landing pad

[Serguei Katkov via Phabricator via llvm-commits]

skatkov created this revision.
skatkov added reviewers: reames, dantrushin.
Herald added a subscriber: hiraditya.
skatkov requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

Default value is not changed, so it is NFC actually.

The option allows to use gc values on registers in landing pads.


https://reviews.llvm.org/D94469

Files:
  llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp


Index: llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
+++ llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
@@ -64,6 +64,10 @@
     "use-registers-for-deopt-values", cl::Hidden, cl::init(false),
     cl::desc("Allow using registers for non pointer deopt args"));
 
+cl::opt<bool> UseRegistersForGCPointersInLandingPad(
+    "use-registers-for-gc-values-in-landing-pad", cl::Hidden, cl::init(false),
+    cl::desc("Allow using registers for gc pointer in landing pad"));
+
 cl::opt<unsigned> MaxRegistersForGCPointers(
     "max-registers-for-gc-values", cl::Hidden, cl::init(0),
     cl::desc("Max number of VRegs allowed to pass GC pointer meta args in"));
@@ -549,14 +553,15 @@
   // Pointers used on exceptional path of invoke statepoint.
   // We cannot assing them to VRegs.
   SmallSet<SDValue, 8> LPadPointers;
-  if (auto *StInvoke = dyn_cast_or_null<InvokeInst>(SI.StatepointInstr)) {
-    LandingPadInst *LPI = StInvoke->getLandingPadInst();
-    for (auto *Relocate : SI.GCRelocates)
-      if (Relocate->getOperand(0) == LPI) {
-        LPadPointers.insert(Builder.getValue(Relocate->getBasePtr()));
-        LPadPointers.insert(Builder.getValue(Relocate->getDerivedPtr()));
-      }
-  }
+  if (!UseRegistersForGCPointersInLandingPad)
+    if (auto *StInvoke = dyn_cast_or_null<InvokeInst>(SI.StatepointInstr)) {
+      LandingPadInst *LPI = StInvoke->getLandingPadInst();
+      for (auto *Relocate : SI.GCRelocates)
+        if (Relocate->getOperand(0) == LPI) {
+          LPadPointers.insert(Builder.getValue(Relocate->getBasePtr()));
+          LPadPointers.insert(Builder.getValue(Relocate->getDerivedPtr()));
+        }
+    }
 
   LLVM_DEBUG(dbgs() << "Deciding how to lower GC Pointers:\n");
 


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