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[PruneEH] Reuse code from removeUnwindEdge

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PruneEH had functionality idential to removeUnwindEdge.
Consolidate around removeUnwindEdge.
No functionality change is intended.

llvm-svn: 258609
This commit is contained in:
David Majnemer 2016-01-23 05:41:22 +00:00
parent 38b08addbb
commit 0728f4a41f
1 changed files with 2 additions and 25 deletions
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27
lib/Transforms/IPO/PruneEH.cpp
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@ -29,6 +29,7 @@
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Transforms/Utils/Local.h"
#include <algorithm>
using namespace llvm;
@ -186,32 +187,8 @@ bool PruneEH::SimplifyFunction(Function *F) {
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator()))
if (II->doesNotThrow() && canSimplifyInvokeNoUnwind(F)) {
SmallVector<Value*, 8> Args(II->arg_begin(), II->arg_end());
SmallVector<OperandBundleDef, 1> OpBundles;
II->getOperandBundlesAsDefs(OpBundles);
// Insert a call instruction before the invoke.
CallInst *Call = CallInst::Create(II->getCalledValue(), Args, OpBundles,
"", II);
Call->takeName(II);
Call->setCallingConv(II->getCallingConv());
Call->setAttributes(II->getAttributes());
Call->setDebugLoc(II->getDebugLoc());
// Anything that used the value produced by the invoke instruction
// now uses the value produced by the call instruction. Note that we
// do this even for void functions and calls with no uses so that the
// callgraph edge is updated.
II->replaceAllUsesWith(Call);
BasicBlock *UnwindBlock = II->getUnwindDest();
UnwindBlock->removePredecessor(II->getParent());
// Insert a branch to the normal destination right before the
// invoke.
BranchInst::Create(II->getNormalDest(), II);
// Finally, delete the invoke instruction!
BB->getInstList().pop_back();
removeUnwindEdge(&*BB);
// If the unwind block is now dead, nuke it.
if (pred_empty(UnwindBlock))