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Implement trivial sinking for load instructions. This causes us to sink 567 loads in spec

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18692 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-09 07:14:34 +00:00
parent 389bd04b96
commit 96a52a6f6c
1 changed files with 11 additions and 1 deletions
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12
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4206,7 +4206,17 @@ static bool TryToSinkInstruction(Instruction *I, BasicBlock *DestBlock) {
if (isa<AllocaInst>(I) && I->getParent() == &DestBlock->getParent()->front())
return false;
if (isa<LoadInst>(I)) return false;
// We can only sink load instructions if there is nothing between the load and
// the end of block that could change the value.
if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
if (LI->isVolatile()) return false; // Don't sink volatile loads.
for (BasicBlock::iterator Scan = LI, E = LI->getParent()->end();
Scan != E; ++Scan)
if (Scan->mayWriteToMemory())
return false;
std::cerr << "SUNK LOAD: " << *LI;
}
BasicBlock::iterator InsertPos = DestBlock->begin();
while (isa<PHINode>(InsertPos)) ++InsertPos;