[WinEHPrepare] Add rudimentary support for the new EH instructions
This adds somewhat basic preparation functionality including:
- Formation of funclets via coloring basic blocks.
- Cloning of polychromatic blocks to ensure that funclets have unique
program counters.
- Demotion of values used between different funclets.
- Some amount of cleanup once we have removed predecessors from basic
blocks.
- Verification that we are left with a CFG that makes some amount of
sense.
N.B. Arguments and numbering still need to be done.
Differential Revision: http://reviews.llvm.org/D11750
llvm-svn: 244558
diff --git a/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp b/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
index f11b6099..1d7c740 100644
--- a/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
+++ b/llvm/lib/Transforms/Utils/DemoteRegToStack.cpp
@@ -135,7 +135,7 @@
// Insert a load in place of the PHI and replace all uses.
BasicBlock::iterator InsertPt = P;
- for (; isa<PHINode>(InsertPt) || isa<LandingPadInst>(InsertPt); ++InsertPt)
+ for (; isa<PHINode>(InsertPt) || InsertPt->isEHPad(); ++InsertPt)
/* empty */; // Don't insert before PHI nodes or landingpad instrs.
Value *V = new LoadInst(Slot, P->getName()+".reload", InsertPt);