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Remove redundant comment. Use a more efficient datatype.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150780 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2012-02-17 02:12:54 +00:00
parent 1bc147b892
commit 3106b8b18b
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. // 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/Transforms/Utils/Local.h"
#include "llvm/Function.h" #include "llvm/Function.h"
#include "llvm/Instructions.h" #include "llvm/Instructions.h"
#include "llvm/Type.h" #include "llvm/Type.h"
#include <map> #include "llvm/ADT/DenseMap.h"
using namespace llvm; using namespace llvm;
/// DemoteRegToStack - This function takes a virtual register computed by an /// 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 /// alloca. This allows the CFG to be changed around without fear of
/// invalidating the SSA information for the value. It returns the pointer to /// invalidating the SSA information for the value. It returns the pointer to
/// the alloca inserted to create a stack slot for I. /// 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) { Instruction *AllocaPoint) {
if (I.use_empty()) { if (I.use_empty()) {
I.eraseFromParent(); 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 // 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 // from the same block, which is illegal SSA form. For this reason, we
// keep track of and reuse loads we insert. // 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) for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == &I) { if (PN->getIncomingValue(i) == &I) {
Value *&V = Loads[PN->getIncomingBlock(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 /// 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. /// 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. /// 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()) { if (P->use_empty()) {
P->eraseFromParent(); P->eraseFromParent();
return 0; return 0;