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authorrdivacky <rdivacky@FreeBSD.org>2009-10-14 17:57:32 +0000
committerrdivacky <rdivacky@FreeBSD.org>2009-10-14 17:57:32 +0000
commitcd749a9c07f1de2fb8affde90537efa4bc3e7c54 (patch)
treeb21f6de4e08b89bb7931806bab798fc2a5e3a686 /lib/Transforms/Scalar/Reg2Mem.cpp
parent72621d11de5b873f1695f391eb95f0b336c3d2d4 (diff)
downloadFreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.zip
FreeBSD-src-cd749a9c07f1de2fb8affde90537efa4bc3e7c54.tar.gz
Update llvm to r84119.
Diffstat (limited to 'lib/Transforms/Scalar/Reg2Mem.cpp')
-rw-r--r--lib/Transforms/Scalar/Reg2Mem.cpp133
1 files changed, 68 insertions, 65 deletions
diff --git a/lib/Transforms/Scalar/Reg2Mem.cpp b/lib/Transforms/Scalar/Reg2Mem.cpp
index ac95d25..99e1252 100644
--- a/lib/Transforms/Scalar/Reg2Mem.cpp
+++ b/lib/Transforms/Scalar/Reg2Mem.cpp
@@ -26,7 +26,6 @@
#include "llvm/BasicBlock.h"
#include "llvm/Instructions.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Support/CFG.h"
#include <list>
using namespace llvm;
@@ -35,7 +34,7 @@ STATISTIC(NumRegsDemoted, "Number of registers demoted");
STATISTIC(NumPhisDemoted, "Number of phi-nodes demoted");
namespace {
- struct VISIBILITY_HIDDEN RegToMem : public FunctionPass {
+ struct RegToMem : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
RegToMem() : FunctionPass(&ID) {}
@@ -44,73 +43,17 @@ namespace {
AU.addPreservedID(BreakCriticalEdgesID);
}
- bool valueEscapes(Instruction* i) {
- BasicBlock* bb = i->getParent();
- for (Value::use_iterator ii = i->use_begin(), ie = i->use_end();
- ii != ie; ++ii)
- if (cast<Instruction>(*ii)->getParent() != bb ||
- isa<PHINode>(*ii))
+ bool valueEscapes(const Instruction *Inst) const {
+ const BasicBlock *BB = Inst->getParent();
+ for (Value::use_const_iterator UI = Inst->use_begin(),E = Inst->use_end();
+ UI != E; ++UI)
+ if (cast<Instruction>(*UI)->getParent() != BB ||
+ isa<PHINode>(*UI))
return true;
return false;
}
- virtual bool runOnFunction(Function &F) {
- if (!F.isDeclaration()) {
- // Insert all new allocas into entry block.
- BasicBlock* BBEntry = &F.getEntryBlock();
- assert(pred_begin(BBEntry) == pred_end(BBEntry) &&
- "Entry block to function must not have predecessors!");
-
- // Find first non-alloca instruction and create insertion point. This is
- // safe if block is well-formed: it always have terminator, otherwise
- // we'll get and assertion.
- BasicBlock::iterator I = BBEntry->begin();
- while (isa<AllocaInst>(I)) ++I;
-
- CastInst *AllocaInsertionPoint =
- CastInst::Create(Instruction::BitCast,
- Context->getNullValue(Type::Int32Ty), Type::Int32Ty,
- "reg2mem alloca point", I);
-
- // Find the escaped instructions. But don't create stack slots for
- // allocas in entry block.
- std::list<Instruction*> worklist;
- for (Function::iterator ibb = F.begin(), ibe = F.end();
- ibb != ibe; ++ibb)
- for (BasicBlock::iterator iib = ibb->begin(), iie = ibb->end();
- iib != iie; ++iib) {
- if (!(isa<AllocaInst>(iib) && iib->getParent() == BBEntry) &&
- valueEscapes(iib)) {
- worklist.push_front(&*iib);
- }
- }
-
- // Demote escaped instructions
- NumRegsDemoted += worklist.size();
- for (std::list<Instruction*>::iterator ilb = worklist.begin(),
- ile = worklist.end(); ilb != ile; ++ilb)
- DemoteRegToStack(**ilb, false, AllocaInsertionPoint);
-
- worklist.clear();
-
- // Find all phi's
- for (Function::iterator ibb = F.begin(), ibe = F.end();
- ibb != ibe; ++ibb)
- for (BasicBlock::iterator iib = ibb->begin(), iie = ibb->end();
- iib != iie; ++iib)
- if (isa<PHINode>(iib))
- worklist.push_front(&*iib);
-
- // Demote phi nodes
- NumPhisDemoted += worklist.size();
- for (std::list<Instruction*>::iterator ilb = worklist.begin(),
- ile = worklist.end(); ilb != ile; ++ilb)
- DemotePHIToStack(cast<PHINode>(*ilb), AllocaInsertionPoint);
-
- return true;
- }
- return false;
- }
+ virtual bool runOnFunction(Function &F);
};
}
@@ -118,6 +61,66 @@ char RegToMem::ID = 0;
static RegisterPass<RegToMem>
X("reg2mem", "Demote all values to stack slots");
+
+bool RegToMem::runOnFunction(Function &F) {
+ if (F.isDeclaration())
+ return false;
+
+ // Insert all new allocas into entry block.
+ BasicBlock *BBEntry = &F.getEntryBlock();
+ assert(pred_begin(BBEntry) == pred_end(BBEntry) &&
+ "Entry block to function must not have predecessors!");
+
+ // Find first non-alloca instruction and create insertion point. This is
+ // safe if block is well-formed: it always have terminator, otherwise
+ // we'll get and assertion.
+ BasicBlock::iterator I = BBEntry->begin();
+ while (isa<AllocaInst>(I)) ++I;
+
+ CastInst *AllocaInsertionPoint =
+ new BitCastInst(Constant::getNullValue(Type::getInt32Ty(F.getContext())),
+ Type::getInt32Ty(F.getContext()),
+ "reg2mem alloca point", I);
+
+ // Find the escaped instructions. But don't create stack slots for
+ // allocas in entry block.
+ std::list<Instruction*> WorkList;
+ for (Function::iterator ibb = F.begin(), ibe = F.end();
+ ibb != ibe; ++ibb)
+ for (BasicBlock::iterator iib = ibb->begin(), iie = ibb->end();
+ iib != iie; ++iib) {
+ if (!(isa<AllocaInst>(iib) && iib->getParent() == BBEntry) &&
+ valueEscapes(iib)) {
+ WorkList.push_front(&*iib);
+ }
+ }
+
+ // Demote escaped instructions
+ NumRegsDemoted += WorkList.size();
+ for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
+ ile = WorkList.end(); ilb != ile; ++ilb)
+ DemoteRegToStack(**ilb, false, AllocaInsertionPoint);
+
+ WorkList.clear();
+
+ // Find all phi's
+ for (Function::iterator ibb = F.begin(), ibe = F.end();
+ ibb != ibe; ++ibb)
+ for (BasicBlock::iterator iib = ibb->begin(), iie = ibb->end();
+ iib != iie; ++iib)
+ if (isa<PHINode>(iib))
+ WorkList.push_front(&*iib);
+
+ // Demote phi nodes
+ NumPhisDemoted += WorkList.size();
+ for (std::list<Instruction*>::iterator ilb = WorkList.begin(),
+ ile = WorkList.end(); ilb != ile; ++ilb)
+ DemotePHIToStack(cast<PHINode>(*ilb), AllocaInsertionPoint);
+
+ return true;
+}
+
+
// createDemoteRegisterToMemory - Provide an entry point to create this pass.
//
const PassInfo *const llvm::DemoteRegisterToMemoryID = &X;
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