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Use IRBuiler while constant folding terminator.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2011-05-18 17:26:46 +00:00
parent 5ceb66692e
commit 62fb3556ea
2 changed files with 12 additions and 9 deletions
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17
lib/Transforms/Utils/Local.cpp
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@ -34,6 +34,7 @@
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/SUpport/IRBuilder.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/Support/raw_ostream.h"
@ -49,6 +50,7 @@ using namespace llvm;
//
bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
TerminatorInst *T = BB->getTerminator();
IRBuilder<> Builder(T);
// Branch - See if we are conditional jumping on constant
if (BranchInst *BI = dyn_cast<BranchInst>(T)) {
@ -71,7 +73,7 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
OldDest->removePredecessor(BB);
// Replace the conditional branch with an unconditional one.
BranchInst::Create(Destination, BI);
Builder.CreateBr(Destination);
BI->eraseFromParent();
return true;
}
@ -86,7 +88,7 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
Dest1->removePredecessor(BI->getParent());
// Replace the conditional branch with an unconditional one.
BranchInst::Create(Dest1, BI);
Builder.CreateBr(Dest1);
BI->eraseFromParent();
return true;
}
@ -136,7 +138,7 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
// now.
if (TheOnlyDest) {
// Insert the new branch.
BranchInst::Create(TheOnlyDest, SI);
Builder.CreateBr(TheOnlyDest);
BasicBlock *BB = SI->getParent();
// Remove entries from PHI nodes which we no longer branch to...
@ -157,10 +159,11 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
if (SI->getNumSuccessors() == 2) {
// Otherwise, we can fold this switch into a conditional branch
// instruction if it has only one non-default destination.
Value *Cond = new ICmpInst(SI, ICmpInst::ICMP_EQ, SI->getCondition(),
SI->getSuccessorValue(1), "cond");
Value *Cond = Builder.CreateICmpEQ(SI->getCondition(),
SI->getSuccessorValue(1), "cond");
// Insert the new branch.
BranchInst::Create(SI->getSuccessor(1), SI->getSuccessor(0), Cond, SI);
Builder.CreateCondBr(Cond, SI->getSuccessor(1), SI->getSuccessor(0));
// Delete the old switch.
SI->eraseFromParent();
@ -175,7 +178,7 @@ bool llvm::ConstantFoldTerminator(BasicBlock *BB) {
dyn_cast<BlockAddress>(IBI->getAddress()->stripPointerCasts())) {
BasicBlock *TheOnlyDest = BA->getBasicBlock();
// Insert the new branch.
BranchInst::Create(TheOnlyDest, IBI);
Builder.CreateBr(TheOnlyDest);
for (unsigned i = 0, e = IBI->getNumDestinations(); i != e; ++i) {
if (IBI->getDestination(i) == TheOnlyDest)