mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-13 23:18:51 +00:00
90c579de5a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
//===-- NEONMoveFix.cpp - Convert vfp reg-reg moves into neon ---*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "neon-mov-fix"
|
|
#include "ARM.h"
|
|
#include "ARMMachineFunctionInfo.h"
|
|
#include "ARMInstrInfo.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
STATISTIC(NumVMovs, "Number of reg-reg moves converted");
|
|
|
|
namespace {
|
|
struct NEONMoveFixPass : public MachineFunctionPass {
|
|
static char ID;
|
|
NEONMoveFixPass() : MachineFunctionPass(ID) {}
|
|
|
|
virtual bool runOnMachineFunction(MachineFunction &Fn);
|
|
|
|
virtual const char *getPassName() const {
|
|
return "NEON reg-reg move conversion";
|
|
}
|
|
|
|
private:
|
|
const TargetRegisterInfo *TRI;
|
|
const ARMBaseInstrInfo *TII;
|
|
|
|
typedef DenseMap<unsigned, const MachineInstr*> RegMap;
|
|
|
|
bool InsertMoves(MachineBasicBlock &MBB);
|
|
};
|
|
char NEONMoveFixPass::ID = 0;
|
|
}
|
|
|
|
bool NEONMoveFixPass::InsertMoves(MachineBasicBlock &MBB) {
|
|
RegMap Defs;
|
|
bool Modified = false;
|
|
|
|
// Walk over MBB tracking the def points of the registers.
|
|
MachineBasicBlock::iterator MII = MBB.begin(), E = MBB.end();
|
|
MachineBasicBlock::iterator NextMII;
|
|
for (; MII != E; MII = NextMII) {
|
|
NextMII = llvm::next(MII);
|
|
MachineInstr *MI = &*MII;
|
|
|
|
if (MI->getOpcode() == ARM::VMOVD &&
|
|
!TII->isPredicated(MI)) {
|
|
unsigned SrcReg = MI->getOperand(1).getReg();
|
|
// If we do not find an instruction defining the reg, this means the
|
|
// register should be live-in for this BB. It's always to better to use
|
|
// NEON reg-reg moves.
|
|
unsigned Domain = ARMII::DomainNEON;
|
|
RegMap::iterator DefMI = Defs.find(SrcReg);
|
|
if (DefMI != Defs.end()) {
|
|
Domain = DefMI->second->getDesc().TSFlags & ARMII::DomainMask;
|
|
// Instructions in general domain are subreg accesses.
|
|
// Map them to NEON reg-reg moves.
|
|
if (Domain == ARMII::DomainGeneral)
|
|
Domain = ARMII::DomainNEON;
|
|
}
|
|
|
|
if (Domain & ARMII::DomainNEON) {
|
|
// Convert VMOVD to VMOVDneon
|
|
unsigned DestReg = MI->getOperand(0).getReg();
|
|
|
|
DEBUG({errs() << "vmov convert: "; MI->dump();});
|
|
|
|
// It's safe to ignore imp-defs / imp-uses here, since:
|
|
// - We're running late, no intelligent condegen passes should be run
|
|
// afterwards
|
|
// - The imp-defs / imp-uses are superregs only, we don't care about
|
|
// them.
|
|
AddDefaultPred(BuildMI(MBB, *MI, MI->getDebugLoc(),
|
|
TII->get(ARM::VMOVDneon), DestReg).addReg(SrcReg));
|
|
MBB.erase(MI);
|
|
MachineBasicBlock::iterator I = prior(NextMII);
|
|
MI = &*I;
|
|
|
|
DEBUG({errs() << " into: "; MI->dump();});
|
|
|
|
Modified = true;
|
|
++NumVMovs;
|
|
} else {
|
|
assert((Domain & ARMII::DomainVFP) && "Invalid domain!");
|
|
// Do nothing.
|
|
}
|
|
}
|
|
|
|
// Update def information.
|
|
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
|
|
const MachineOperand& MO = MI->getOperand(i);
|
|
if (!MO.isReg() || !MO.isDef())
|
|
continue;
|
|
unsigned MOReg = MO.getReg();
|
|
|
|
Defs[MOReg] = MI;
|
|
// Catch aliases as well.
|
|
for (const unsigned *R = TRI->getAliasSet(MOReg); *R; ++R)
|
|
Defs[*R] = MI;
|
|
}
|
|
}
|
|
|
|
return Modified;
|
|
}
|
|
|
|
bool NEONMoveFixPass::runOnMachineFunction(MachineFunction &Fn) {
|
|
ARMFunctionInfo *AFI = Fn.getInfo<ARMFunctionInfo>();
|
|
const TargetMachine &TM = Fn.getTarget();
|
|
|
|
if (AFI->isThumb1OnlyFunction())
|
|
return false;
|
|
|
|
TRI = TM.getRegisterInfo();
|
|
TII = static_cast<const ARMBaseInstrInfo*>(TM.getInstrInfo());
|
|
|
|
bool Modified = false;
|
|
for (MachineFunction::iterator MFI = Fn.begin(), E = Fn.end(); MFI != E;
|
|
++MFI) {
|
|
MachineBasicBlock &MBB = *MFI;
|
|
Modified |= InsertMoves(MBB);
|
|
}
|
|
|
|
return Modified;
|
|
}
|
|
|
|
/// createNEONMoveFixPass - Returns an instance of the NEON reg-reg moves fix
|
|
/// pass.
|
|
FunctionPass *llvm::createNEONMoveFixPass() {
|
|
return new NEONMoveFixPass();
|
|
}
|