Add "first class" lowering for deopt operand bundles

Summary:
After this change, deopt operand bundles can be lowered directly by
SelectionDAG into STATEPOINT instructions (which are then lowered to a
call or sequence of nop, with an associated __llvm_stackmaps entry0.
This obviates the need to round-trip deoptimization state through
gc.statepoint via RewriteStatepointsForGC.

Reviewers: reames, atrick, majnemer, JosephTremoulet, pgavlin

Subscribers: sanjoy, mcrosier, majnemer, llvm-commits

Differential Revision: http://reviews.llvm.org/D18257

llvm-svn: 264015

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index fc12be0719b..5e27a1c7147 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -772,12 +772,16 @@ public:
   };
 
   /// Lower \p SLI into a STATEPOINT instruction.
-  SDValue LowerAsStatepoint(StatepointLoweringInfo &SLI);
+  SDValue LowerAsSTATEPOINT(StatepointLoweringInfo &SLI);
 
   // This function is responsible for the whole statepoint lowering process.
   // It uniformly handles invoke and call statepoints.
   void LowerStatepoint(ImmutableStatepoint Statepoint,
                        const BasicBlock *EHPadBB = nullptr);
+
+  void LowerCallSiteWithDeoptBundle(ImmutableCallSite CS, SDValue Callee,
+                                    const BasicBlock *EHPadBB);
+
 private:
   // Terminator instructions.
   void visitRet(const ReturnInst &I);