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Remove redundant comment. Use a more efficient datatype.

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llvm-svn: 150780
This commit is contained in:
Bill Wendling 2012-02-17 02:12:54 +00:00
parent b2fd149709
commit 1c92c9b270
1 changed files with 4 additions and 13 deletions
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17
lib/Transforms/Utils/DemoteRegToStack.cpp
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@ -6,21 +6,12 @@
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provide the function DemoteRegToStack(). This function takes a
// virtual register computed by an Instruction and replaces it with a slot in
// the stack frame, allocated via alloca. It returns the pointer to the
// AllocaInst inserted. After this function is called on an instruction, we are
// guaranteed that the only user of the instruction is a store that is
// immediately after it.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Type.h"
#include <map>
#include "llvm/ADT/DenseMap.h"
using namespace llvm;
/// DemoteRegToStack - This function takes a virtual register computed by an
@ -28,7 +19,7 @@ using namespace llvm;
/// alloca. This allows the CFG to be changed around without fear of
/// invalidating the SSA information for the value. It returns the pointer to
/// the alloca inserted to create a stack slot for I.
AllocaInst* llvm::DemoteRegToStack(Instruction &I, bool VolatileLoads,
AllocaInst *llvm::DemoteRegToStack(Instruction &I, bool VolatileLoads,
Instruction *AllocaPoint) {
if (I.use_empty()) {
I.eraseFromParent();
@ -59,7 +50,7 @@ AllocaInst* llvm::DemoteRegToStack(Instruction &I, bool VolatileLoads,
// resulting PHI node will have multiple values (from each load) coming in
// from the same block, which is illegal SSA form. For this reason, we
// keep track of and reuse loads we insert.
std::map<BasicBlock*, Value*> Loads;
DenseMap<BasicBlock*, Value*> Loads;
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == &I) {
Value *&V = Loads[PN->getIncomingBlock(i)];
@ -105,7 +96,7 @@ AllocaInst* llvm::DemoteRegToStack(Instruction &I, bool VolatileLoads,
/// DemotePHIToStack - This function takes a virtual register computed by a PHI
/// node and replaces it with a slot in the stack frame allocated via alloca.
/// The PHI node is deleted. It returns the pointer to the alloca inserted.
AllocaInst* llvm::DemotePHIToStack(PHINode *P, Instruction *AllocaPoint) {
AllocaInst *llvm::DemotePHIToStack(PHINode *P, Instruction *AllocaPoint) {
if (P->use_empty()) {
P->eraseFromParent();
return 0;