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https://github.com/c64scene-ar/llvm-6502.git
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f99998a2b0
Previously mips16 was sharing the pattern addr which is used for mips32 and mips64. This had a number of problems: 1) Storing and loading byte and halfword quantities for mips16 has particular problems due to the primarily non mips16 nature of SP. When we must load/store byte/halfword stack objects in a function, we must create a mips16 alias register for SP. This functionality is tested in stchar.ll. 2) We need to have an FP register under certain conditions (such as dynamically sized alloca). We use mips16 register S0 for this purpose. In this case, we also use this register when accessing frame objects so this issue also affects the complex pattern addr16. This functionality is tested in alloca16.ll. The Mips16InstrInfo.td has been updated to use addr16 instead of addr. The complex pattern C++ function for addr has been copied to addr16 and updated to reflect the above issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166897 91177308-0d34-0410-b5e6-96231b3b80d8
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
//===-- Mips16RegisterInfo.cpp - MIPS16 Register Information -== ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the MIPS16 implementation of the TargetRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "Mips16RegisterInfo.h"
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#include "Mips.h"
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#include "MipsAnalyzeImmediate.h"
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#include "MipsInstrInfo.h"
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#include "MipsSubtarget.h"
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#include "MipsMachineFunction.h"
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#include "llvm/Constants.h"
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#include "llvm/DebugInfo.h"
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#include "llvm/Type.h"
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#include "llvm/Function.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace llvm;
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Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST)
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: MipsRegisterInfo(ST) {}
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// This function eliminate ADJCALLSTACKDOWN,
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// ADJCALLSTACKUP pseudo instructions
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void Mips16RegisterInfo::
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const {
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// Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
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MBB.erase(I);
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}
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void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
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unsigned OpNo, int FrameIndex,
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uint64_t StackSize,
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int64_t SPOffset) const {
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MachineInstr &MI = *II;
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MachineFunction &MF = *MI.getParent()->getParent();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
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int MinCSFI = 0;
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int MaxCSFI = -1;
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if (CSI.size()) {
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MinCSFI = CSI[0].getFrameIdx();
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MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
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}
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// The following stack frame objects are always
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// referenced relative to $sp:
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// 1. Outgoing arguments.
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// 2. Pointer to dynamically allocated stack space.
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// 3. Locations for callee-saved registers.
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// Everything else is referenced relative to whatever register
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// getFrameRegister() returns.
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unsigned FrameReg;
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if (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI)
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FrameReg = Mips::SP;
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else {
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const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
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if (TFI->hasFP(MF)) {
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FrameReg = Mips::S0;
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}
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else {
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if ((MI.getNumOperands()> OpNo+2) && MI.getOperand(OpNo+2).isReg())
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FrameReg = MI.getOperand(OpNo+2).getReg();
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else
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FrameReg = Mips::SP;
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}
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}
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// Calculate final offset.
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// - There is no need to change the offset if the frame object
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// is one of the
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// following: an outgoing argument, pointer to a dynamically allocated
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// stack space or a $gp restore location,
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// - If the frame object is any of the following,
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// its offset must be adjusted
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// by adding the size of the stack:
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// incoming argument, callee-saved register location or local variable.
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int64_t Offset;
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Offset = SPOffset + (int64_t)StackSize;
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Offset += MI.getOperand(OpNo + 1).getImm();
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DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
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MI.getOperand(OpNo).ChangeToRegister(FrameReg, false);
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MI.getOperand(OpNo + 1).ChangeToImmediate(Offset);
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}
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