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[PowerPC] Remove the PPCVSXCopyCleanup pass

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This MI-level pass was necessary when VSX support was first being developed,
specifically, before the ABI code had been updated to use VSX registers for
arguments (the register assignments did not change, in a physical sense, but
the VSX super-registers are now used). Unfortunately, I never went back and
removed this pass after that was done. I believe this code is now effectively
dead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227767 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2015-02-01 21:20:58 +00:00
parent f9fd8193fb
commit 2767054823
3 changed files with 0 additions and 79 deletions
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1
lib/Target/PowerPC/PPC.h
View File

@ -36,7 +36,6 @@ namespace llvm {
#endif
FunctionPass *createPPCEarlyReturnPass();
FunctionPass *createPPCVSXCopyPass();
FunctionPass *createPPCVSXCopyCleanupPass();
FunctionPass *createPPCVSXFMAMutatePass();
FunctionPass *createPPCBranchSelectionPass();
FunctionPass *createPPCISelDag(PPCTargetMachine &TM);

76
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -2035,82 +2035,6 @@ char PPCVSXCopy::ID = 0;
FunctionPass*
llvm::createPPCVSXCopyPass() { return new PPCVSXCopy(); }
#undef DEBUG_TYPE
#define DEBUG_TYPE "ppc-vsx-copy-cleanup"
namespace llvm {
void initializePPCVSXCopyCleanupPass(PassRegistry&);
}
namespace {
// PPCVSXCopyCleanup pass - We sometimes end up generating self copies of VSX
// registers (mostly because the ABI code still places all values into the
// "traditional" floating-point and vector registers). Remove them here.
struct PPCVSXCopyCleanup : public MachineFunctionPass {
static char ID;
PPCVSXCopyCleanup() : MachineFunctionPass(ID) {
initializePPCVSXCopyCleanupPass(*PassRegistry::getPassRegistry());
}
const TargetInstrInfo *TII;
protected:
bool processBlock(MachineBasicBlock &MBB) {
bool Changed = false;
SmallVector<MachineInstr *, 4> ToDelete;
for (MachineBasicBlock::iterator I = MBB.begin(), IE = MBB.end();
I != IE; ++I) {
MachineInstr *MI = I;
if (MI->getOpcode() == PPC::XXLOR &&
MI->getOperand(0).getReg() == MI->getOperand(1).getReg() &&
MI->getOperand(0).getReg() == MI->getOperand(2).getReg())
ToDelete.push_back(MI);
}
if (!ToDelete.empty())
Changed = true;
for (unsigned i = 0, ie = ToDelete.size(); i != ie; ++i) {
DEBUG(dbgs() << "Removing VSX self-copy: " << *ToDelete[i]);
ToDelete[i]->eraseFromParent();
}
return Changed;
}
public:
bool runOnMachineFunction(MachineFunction &MF) override {
// If we don't have VSX don't bother doing anything here.
const PPCSubtarget &STI = MF.getSubtarget<PPCSubtarget>();
if (!STI.hasVSX())
return false;
TII = STI.getInstrInfo();
bool Changed = false;
for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
MachineBasicBlock &B = *I++;
if (processBlock(B))
Changed = true;
}
return Changed;
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
MachineFunctionPass::getAnalysisUsage(AU);
}
};
}
INITIALIZE_PASS(PPCVSXCopyCleanup, DEBUG_TYPE,
"PowerPC VSX Copy Cleanup", false, false)
char PPCVSXCopyCleanup::ID = 0;
FunctionPass*
llvm::createPPCVSXCopyCleanupPass() { return new PPCVSXCopyCleanup(); }
#undef DEBUG_TYPE
#define DEBUG_TYPE "ppc-early-ret"
STATISTIC(NumBCLR, "Number of early conditional returns");

2
lib/Target/PowerPC/PPCTargetMachine.cpp
View File

@ -262,8 +262,6 @@ void PPCPassConfig::addPreRegAlloc() {
}
void PPCPassConfig::addPreSched2() {
addPass(createPPCVSXCopyCleanupPass(), false);
if (getOptLevel() != CodeGenOpt::None)
addPass(&IfConverterID);
}