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
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index e36f99f..8c738ff 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -1351,6 +1351,12 @@
return false;
}
+ // FastISel does not handle any operand bundles except OB_funclet.
+ if (ImmutableCallSite CS = ImmutableCallSite(I))
+ for (unsigned i = 0, e = CS.getNumOperandBundles(); i != e; ++i)
+ if (CS.getOperandBundleAt(i).getTagID() != LLVMContext::OB_funclet)
+ return false;
+
DbgLoc = I->getDebugLoc();
SavedInsertPt = FuncInfo.InsertPt;