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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24847 91177308-0d34-0410-b5e6-96231b3b80d8
124 lines
4.4 KiB
C++
124 lines
4.4 KiB
C++
//===-- FPMover.cpp - SparcV8 double-precision floating point move fixer --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Expand FpMOVD/FpABSD/FpNEGD instructions into their single-precision pieces.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcV8.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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namespace {
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Statistic<> NumFpDs("fpmover", "Number of instructions translated");
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Statistic<> NoopFpDs("fpmover", "Number of noop instructions removed");
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struct FPMover : public MachineFunctionPass {
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/// Target machine description which we query for reg. names, data
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/// layout, etc.
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///
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TargetMachine &TM;
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FPMover(TargetMachine &tm) : TM(tm) { }
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virtual const char *getPassName() const {
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return "SparcV8 Double-FP Move Fixer";
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}
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bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
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bool runOnMachineFunction(MachineFunction &F) {
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bool Changed = false;
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for (MachineFunction::iterator FI = F.begin(), FE = F.end();
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FI != FE; ++FI)
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Changed |= runOnMachineBasicBlock(*FI);
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return Changed;
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}
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};
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} // end of anonymous namespace
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/// createSparcV8FPMoverPass - Returns a pass that turns FpMOVD
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/// instructions into FMOVS instructions
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///
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FunctionPass *llvm::createSparcV8FPMoverPass(TargetMachine &tm) {
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return new FPMover(tm);
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}
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/// getDoubleRegPair - Given a DFP register, return the even and odd FP
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/// registers that correspond to it.
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static void getDoubleRegPair(unsigned DoubleReg, unsigned &EvenReg,
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unsigned &OddReg) {
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static const unsigned EvenHalvesOfPairs[] = {
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V8::F0, V8::F2, V8::F4, V8::F6, V8::F8, V8::F10, V8::F12, V8::F14,
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V8::F16, V8::F18, V8::F20, V8::F22, V8::F24, V8::F26, V8::F28, V8::F30
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};
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static const unsigned OddHalvesOfPairs[] = {
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V8::F1, V8::F3, V8::F5, V8::F7, V8::F9, V8::F11, V8::F13, V8::F15,
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V8::F17, V8::F19, V8::F21, V8::F23, V8::F25, V8::F27, V8::F29, V8::F31
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};
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static const unsigned DoubleRegsInOrder[] = {
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V8::D0, V8::D1, V8::D2, V8::D3, V8::D4, V8::D5, V8::D6, V8::D7, V8::D8,
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V8::D9, V8::D10, V8::D11, V8::D12, V8::D13, V8::D14, V8::D15
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};
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for (unsigned i = 0; i < sizeof(DoubleRegsInOrder)/sizeof(unsigned); ++i)
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if (DoubleRegsInOrder[i] == DoubleReg) {
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EvenReg = EvenHalvesOfPairs[i];
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OddReg = OddHalvesOfPairs[i];
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return;
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}
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assert(0 && "Can't find reg");
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}
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/// runOnMachineBasicBlock - Fixup FpMOVD instructions in this MBB.
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///
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bool FPMover::runOnMachineBasicBlock(MachineBasicBlock &MBB) {
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bool Changed = false;
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for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ) {
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MachineInstr *MI = I++;
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if (MI->getOpcode() == V8::FpMOVD || MI->getOpcode() == V8::FpABSD ||
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MI->getOpcode() == V8::FpNEGD) {
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Changed = true;
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unsigned DestDReg = MI->getOperand(0).getReg();
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unsigned SrcDReg = MI->getOperand(1).getReg();
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if (DestDReg == SrcDReg && MI->getOpcode() == V8::FpMOVD) {
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MBB.erase(MI); // Eliminate the noop copy.
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++NoopFpDs;
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continue;
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}
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unsigned EvenSrcReg = 0, OddSrcReg = 0, EvenDestReg = 0, OddDestReg = 0;
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getDoubleRegPair(DestDReg, EvenDestReg, OddDestReg);
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getDoubleRegPair(SrcDReg, EvenSrcReg, OddSrcReg);
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if (MI->getOpcode() == V8::FpMOVD)
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MI->setOpcode(V8::FMOVS);
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else if (MI->getOpcode() == V8::FpNEGD)
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MI->setOpcode(V8::FNEGS);
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else if (MI->getOpcode() == V8::FpABSD)
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MI->setOpcode(V8::FABSS);
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else
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assert(0 && "Unknown opcode!");
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MI->SetMachineOperandReg(0, EvenDestReg);
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MI->SetMachineOperandReg(1, EvenSrcReg);
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DEBUG(std::cerr << "FPMover: the modified instr is: " << *MI);
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// Insert copy for the other half of the double.
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if (DestDReg != SrcDReg) {
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MI = BuildMI(MBB, I, V8::FMOVS, 1, OddDestReg).addReg(OddSrcReg);
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DEBUG(std::cerr << "FPMover: the inserted instr is: " << *MI);
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}
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++NumFpDs;
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}
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}
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return Changed;
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}
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