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//===-- ExpandUtils.cpp - Helper functions for expansion passes -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Instructions.h"
#include "llvm/Transforms/NaCl.h"
using namespace llvm;
Instruction *llvm::PhiSafeInsertPt(Use *U) {
Instruction *InsertPt = cast<Instruction>(U->getUser());
if (PHINode *PN = dyn_cast<PHINode>(InsertPt)) {
// We cannot insert instructions before a PHI node, so insert
// before the incoming block's terminator. This could be
// suboptimal if the terminator is a conditional.
InsertPt = PN->getIncomingBlock(*U)->getTerminator();
}
return InsertPt;
}
void llvm::PhiSafeReplaceUses(Use *U, Value *NewVal) {
if (PHINode *PN = dyn_cast<PHINode>(U->getUser())) {
// A PHI node can have multiple incoming edges from the same
// block, in which case all these edges must have the same
// incoming value.
BasicBlock *BB = PN->getIncomingBlock(*U);
for (unsigned I = 0; I < PN->getNumIncomingValues(); ++I) {
if (PN->getIncomingBlock(I) == BB)
PN->setIncomingValue(I, NewVal);
}
} else {
U->getUser()->replaceUsesOfWith(U->get(), NewVal);
}
}
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