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Hoist the AllocaInfo struct to the top of the file. 

This struct is nicely independent of everything else, and we already
needed a foward declaration here. It's simpler to just define it
immediately.

llvm-svn: 186780
This commit is contained in:
Chandler Carruth 2013-07-20 23:39:26 +00:00
parent 4711793e8a
commit 48e11fd76d
1 changed files with 57 additions and 59 deletions
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116
llvm/lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -102,7 +102,63 @@ bool llvm::isAllocaPromotable(const AllocaInst *AI) {
namespace {
struct AllocaInfo;
struct AllocaInfo {
SmallVector<BasicBlock *, 32> DefiningBlocks;
SmallVector<BasicBlock *, 32> UsingBlocks;
StoreInst *OnlyStore;
BasicBlock *OnlyBlock;
bool OnlyUsedInOneBlock;
Value *AllocaPointerVal;
DbgDeclareInst *DbgDeclare;
void clear() {
DefiningBlocks.clear();
UsingBlocks.clear();
OnlyStore = 0;
OnlyBlock = 0;
OnlyUsedInOneBlock = true;
AllocaPointerVal = 0;
DbgDeclare = 0;
}
/// Scan the uses of the specified alloca, filling in the AllocaInfo used
/// by the rest of the pass to reason about the uses of this alloca.
void AnalyzeAlloca(AllocaInst *AI) {
clear();
// As we scan the uses of the alloca instruction, keep track of stores,
// and decide whether all of the loads and stores to the alloca are within
// the same basic block.
for (Value::use_iterator UI = AI->use_begin(), E = AI->use_end();
UI != E;) {
Instruction *User = cast<Instruction>(*UI++);
if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
// Remember the basic blocks which define new values for the alloca
DefiningBlocks.push_back(SI->getParent());
AllocaPointerVal = SI->getOperand(0);
OnlyStore = SI;
} else {
LoadInst *LI = cast<LoadInst>(User);
// Otherwise it must be a load instruction, keep track of variable
// reads.
UsingBlocks.push_back(LI->getParent());
AllocaPointerVal = LI;
}
if (OnlyUsedInOneBlock) {
if (OnlyBlock == 0)
OnlyBlock = User->getParent();
else if (OnlyBlock != User->getParent())
OnlyUsedInOneBlock = false;
}
}
DbgDeclare = FindAllocaDbgDeclare(AI);
}
};
// Data package used by RenamePass()
class RenamePassData {
@ -266,64 +322,6 @@ private:
bool QueuePhiNode(BasicBlock *BB, unsigned AllocaIdx, unsigned &Version);
};
struct AllocaInfo {
SmallVector<BasicBlock *, 32> DefiningBlocks;
SmallVector<BasicBlock *, 32> UsingBlocks;
StoreInst *OnlyStore;
BasicBlock *OnlyBlock;
bool OnlyUsedInOneBlock;
Value *AllocaPointerVal;
DbgDeclareInst *DbgDeclare;
void clear() {
DefiningBlocks.clear();
UsingBlocks.clear();
OnlyStore = 0;
OnlyBlock = 0;
OnlyUsedInOneBlock = true;
AllocaPointerVal = 0;
DbgDeclare = 0;
}
/// Scan the uses of the specified alloca, filling in the AllocaInfo used
/// by the rest of the pass to reason about the uses of this alloca.
void AnalyzeAlloca(AllocaInst *AI) {
clear();
// As we scan the uses of the alloca instruction, keep track of stores,
// and decide whether all of the loads and stores to the alloca are within
// the same basic block.
for (Value::use_iterator UI = AI->use_begin(), E = AI->use_end();
UI != E;) {
Instruction *User = cast<Instruction>(*UI++);
if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
// Remember the basic blocks which define new values for the alloca
DefiningBlocks.push_back(SI->getParent());
AllocaPointerVal = SI->getOperand(0);
OnlyStore = SI;
} else {
LoadInst *LI = cast<LoadInst>(User);
// Otherwise it must be a load instruction, keep track of variable
// reads.
UsingBlocks.push_back(LI->getParent());
AllocaPointerVal = LI;
}
if (OnlyUsedInOneBlock) {
if (OnlyBlock == 0)
OnlyBlock = User->getParent();
else if (OnlyBlock != User->getParent())
OnlyUsedInOneBlock = false;
}
}
DbgDeclare = FindAllocaDbgDeclare(AI);
}
};
} // end of anonymous namespace
static void removeLifetimeIntrinsicUsers(AllocaInst *AI) {