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f38df04c3a
with copies, leading to code like this:
lwz r4, 380(r1)
or r10, r4, r4 ;; Last use of r4
By teaching the PPC backend how to fold spills into copies, we now get this
code:
lwz r10, 380(r1)
wow. :)
This reduces a testcase nate sent me from 1505 instructions to 1484.
Note that this could handle FP values but doesn't currently, for reasons
mentioned in the patch
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23298 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
//===- PPC32RegisterInfo.h - PowerPC32 Register Information Impl -*- C++ -*-==//
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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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// This file contains the PowerPC implementation of the MRegisterInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef POWERPC32_REGISTERINFO_H
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#define POWERPC32_REGISTERINFO_H
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#include "PowerPC.h"
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#include "PPC32GenRegisterInfo.h.inc"
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#include <map>
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namespace llvm {
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class Type;
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class PPC32RegisterInfo : public PPC32GenRegisterInfo {
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std::map<unsigned, unsigned> ImmToIdxMap;
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public:
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PPC32RegisterInfo();
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/// Code Generation virtual methods...
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void storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned SrcReg, int FrameIndex) const;
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void loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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unsigned DestReg, int FrameIndex) const;
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void copyRegToReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
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unsigned DestReg, unsigned SrcReg,
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const TargetRegisterClass *RC) const;
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/// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
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/// copy instructions, turning them into load/store instructions.
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virtual MachineInstr* foldMemoryOperand(MachineInstr* MI, unsigned OpNum,
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int FrameIndex) const;
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void eliminateCallFramePseudoInstr(MachineFunction &MF,
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MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const;
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void eliminateFrameIndex(MachineBasicBlock::iterator II) const;
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void emitPrologue(MachineFunction &MF) const;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
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};
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} // end namespace llvm
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#endif
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