132 lines
4.3 KiB
C++
132 lines
4.3 KiB
C++
//=--- RegUsageInfoPropagate.cpp - Register Usage Informartion Propagation --=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// This pass is required to take advantage of the interprocedural register
|
|
/// allocation infrastructure.
|
|
///
|
|
/// This pass iterates through MachineInstrs in a given MachineFunction and at
|
|
/// each callsite queries RegisterUsageInfo for RegMask (calculated based on
|
|
/// actual register allocation) of the callee function, if the RegMask detail
|
|
/// is available then this pass will update the RegMask of the call instruction.
|
|
/// This updated RegMask will be used by the register allocator while allocating
|
|
/// the current MachineFunction.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/MachineBasicBlock.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
|
#include "llvm/CodeGen/Passes.h"
|
|
#include "llvm/CodeGen/RegisterUsageInfo.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/PassAnalysisSupport.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include <map>
|
|
#include <string>
|
|
|
|
namespace llvm {
|
|
void initializeRegUsageInfoPropagationPassPass(PassRegistry &);
|
|
}
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "ip-regalloc"
|
|
|
|
#define RUIP_NAME "Register Usage Information Propagation"
|
|
|
|
namespace {
|
|
class RegUsageInfoPropagationPass : public MachineFunctionPass {
|
|
|
|
public:
|
|
RegUsageInfoPropagationPass() : MachineFunctionPass(ID) {
|
|
PassRegistry &Registry = *PassRegistry::getPassRegistry();
|
|
initializeRegUsageInfoPropagationPassPass(Registry);
|
|
}
|
|
|
|
StringRef getPassName() const override { return RUIP_NAME; }
|
|
|
|
bool runOnMachineFunction(MachineFunction &MF) override;
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override;
|
|
|
|
static char ID;
|
|
|
|
private:
|
|
static void setRegMask(MachineInstr &MI, const uint32_t *RegMask) {
|
|
for (MachineOperand &MO : MI.operands()) {
|
|
if (MO.isRegMask())
|
|
MO.setRegMask(RegMask);
|
|
}
|
|
}
|
|
};
|
|
} // end of anonymous namespace
|
|
char RegUsageInfoPropagationPass::ID = 0;
|
|
|
|
INITIALIZE_PASS_BEGIN(RegUsageInfoPropagationPass, "reg-usage-propagation",
|
|
RUIP_NAME, false, false)
|
|
INITIALIZE_PASS_DEPENDENCY(PhysicalRegisterUsageInfo)
|
|
INITIALIZE_PASS_END(RegUsageInfoPropagationPass, "reg-usage-propagation",
|
|
RUIP_NAME, false, false)
|
|
|
|
FunctionPass *llvm::createRegUsageInfoPropPass() {
|
|
return new RegUsageInfoPropagationPass();
|
|
}
|
|
|
|
void RegUsageInfoPropagationPass::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<PhysicalRegisterUsageInfo>();
|
|
AU.setPreservesAll();
|
|
MachineFunctionPass::getAnalysisUsage(AU);
|
|
}
|
|
|
|
bool RegUsageInfoPropagationPass::runOnMachineFunction(MachineFunction &MF) {
|
|
const Module *M = MF.getFunction()->getParent();
|
|
PhysicalRegisterUsageInfo *PRUI = &getAnalysis<PhysicalRegisterUsageInfo>();
|
|
|
|
DEBUG(dbgs() << " ++++++++++++++++++++ " << getPassName()
|
|
<< " ++++++++++++++++++++ \n");
|
|
DEBUG(dbgs() << "MachineFunction : " << MF.getName() << "\n");
|
|
|
|
bool Changed = false;
|
|
|
|
for (MachineBasicBlock &MBB : MF) {
|
|
for (MachineInstr &MI : MBB) {
|
|
if (!MI.isCall())
|
|
continue;
|
|
DEBUG(dbgs()
|
|
<< "Call Instruction Before Register Usage Info Propagation : \n");
|
|
DEBUG(dbgs() << MI << "\n");
|
|
|
|
auto UpdateRegMask = [&](const Function *F) {
|
|
const auto *RegMask = PRUI->getRegUsageInfo(F);
|
|
if (!RegMask)
|
|
return;
|
|
setRegMask(MI, &(*RegMask)[0]);
|
|
Changed = true;
|
|
};
|
|
|
|
MachineOperand &Operand = MI.getOperand(0);
|
|
if (Operand.isGlobal())
|
|
UpdateRegMask(cast<Function>(Operand.getGlobal()));
|
|
else if (Operand.isSymbol())
|
|
UpdateRegMask(M->getFunction(Operand.getSymbolName()));
|
|
|
|
DEBUG(dbgs()
|
|
<< "Call Instruction After Register Usage Info Propagation : \n");
|
|
DEBUG(dbgs() << MI << "\n");
|
|
}
|
|
}
|
|
|
|
DEBUG(dbgs() << " +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
|
|
"++++++ \n");
|
|
return Changed;
|
|
}
|