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Code refactoring. 

llvm-svn: 71151
This commit is contained in:
Evan Cheng 2009-05-07 05:49:39 +00:00
parent f356a89e92
commit 143bae5dcd
1 changed files with 22 additions and 7 deletions
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29
llvm/lib/CodeGen/CodePlacementOpt.cpp
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@ -24,6 +24,8 @@ using namespace llvm;
namespace {
class CodePlacementOpt : public MachineFunctionPass {
const MachineLoopInfo *MLI;
public:
static char ID;
CodePlacementOpt() : MachineFunctionPass(&ID) {}
@ -39,6 +41,9 @@ namespace {
AU.addPreservedID(MachineDominatorsID);
MachineFunctionPass::getAnalysisUsage(AU);
}
private:
bool AlignLoops(MachineFunction &MF);
};
char CodePlacementOpt::ID = 0;
@ -48,12 +53,9 @@ FunctionPass *llvm::createCodePlacementOptPass() {
return new CodePlacementOpt();
}
bool CodePlacementOpt::runOnMachineFunction(MachineFunction &MF) {
const MachineLoopInfo *MLI = &getAnalysis<MachineLoopInfo>();
if (MLI->empty())
return false; // No loops.
/// AlignLoops - Align loop headers to target preferred alignments.
///
bool CodePlacementOpt::AlignLoops(MachineFunction &MF) {
const TargetLowering *TLI = MF.getTarget().getTargetLowering();
if (!TLI)
return false;
@ -66,6 +68,7 @@ bool CodePlacementOpt::runOnMachineFunction(MachineFunction &MF) {
if (F->hasFnAttr(Attribute::OptimizeForSize))
return false;
bool Changed = false;
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
MachineBasicBlock *MBB = I;
if (MLI->isLoopHeader(MBB)) {
@ -75,8 +78,20 @@ bool CodePlacementOpt::runOnMachineFunction(MachineFunction &MF) {
// to prevent adding noop's inside a loop.
continue;
MBB->setAlignment(Align);
Changed = true;
}
}
return true;
return Changed;
}
bool CodePlacementOpt::runOnMachineFunction(MachineFunction &MF) {
MLI = &getAnalysis<MachineLoopInfo>();
if (MLI->empty())
return false; // No loops.
bool Changed = false;
Changed |= AlignLoops(MF);
return Changed;
}