[llvm-commits] [llvm] r41150 - /llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp

[Evan Cheng]

On Sep 14, 2007, at 8:32 AM, Bruno Cardoso Lopes wrote:

> Hi Evan,
>
> Sorry, I was reviewing my commits and i only saw your email now.
> I'll change that! :)

Thanks!

Evan

>
> 2007/8/27, Evan Cheng <evan.cheng at apple.com>:
>> Hi Bruno,
>>
>> Sparc backend also has a delay slot filler that does exactly the same
>> thing. Can you change this into a target independent pass instead
>> (then you just need to add a target hook to emit nop)?
>>
>> Evan
>>
>> On Aug 17, 2007, at 6:50 PM, Bruno Cardoso Lopes wrote:
>>
>>> Author: bruno
>>> Date: Fri Aug 17 20:50:47 2007
>>> New Revision: 41150
>>>
>>> URL: http://llvm.org/viewvc/llvm-project?rev=41150&view=rev
>>> Log:
>>> A Pass to insert Nops on intructions with DelaySlot
>>>
>>> Added:
>>>    llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp
>>>
>>> Added: llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp
>>> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ 
>>> Mips/MipsDelaySlotFiller.cpp?rev=41150&view=auto
>>>
>>> =
>>> =
>>> =
>>> =
>>> =
>>> =
>>> =
>>> =
>>> ==================================================================== 
>>> ==
>>> --- llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp (added)
>>> +++ llvm/trunk/lib/Target/Mips/MipsDelaySlotFiller.cpp Fri Aug 17
>>> 20:50:47 2007
>>> @@ -0,0 +1,77 @@
>>> +//===-- DelaySlotFiller.cpp - Mips delay slot filler
>>> ---------------------===//
>>> +//
>>> +//                     The LLVM Compiler Infrastructure
>>> +//
>>> +// This file was developed by Bruno Cardoso Lopes and is
>>> distributed under
>>> +// the University of Illinois Open Source License. See LICENSE.TXT
>>> for details.
>>> +//
>>> +//
>>> =
>>> =
>>> =
>>> -------------------------------------------------------------------- 
>>> --=
>>> ==//
>>> +//
>>> +// Simple pass to fills delay slots with NOPs.
>>> +//
>>> +//
>>> =
>>> =
>>> =
>>> -------------------------------------------------------------------- 
>>> --=
>>> ==//
>>> +
>>> +#define DEBUG_TYPE "delay-slot-filler"
>>> +
>>> +#include "Mips.h"
>>> +#include "MipsTargetMachine.h"
>>> +#include "llvm/CodeGen/MachineFunctionPass.h"
>>> +#include "llvm/CodeGen/MachineInstrBuilder.h"
>>> +#include "llvm/Target/TargetInstrInfo.h"
>>> +#include "llvm/ADT/Statistic.h"
>>> +
>>> +using namespace llvm;
>>> +
>>> +STATISTIC(FilledSlots, "Number of delay slots filled");
>>> +
>>> +namespace {
>>> +  struct Filler : public MachineFunctionPass {
>>> +
>>> +    TargetMachine &TM;
>>> +    const TargetInstrInfo *TII;
>>> +
>>> +    static char ID;
>>> +    Filler(TargetMachine &tm)
>>> +      : MachineFunctionPass((intptr_t)&ID), TM(tm),
>>> TII(tm.getInstrInfo()) { }
>>> +
>>> +    virtual const char *getPassName() const {
>>> +      return "Mips Delay Slot Filler";
>>> +    }
>>> +
>>> +    bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
>>> +    bool runOnMachineFunction(MachineFunction &F) {
>>> +      bool Changed = false;
>>> +      for (MachineFunction::iterator FI = F.begin(), FE = F.end();
>>> +           FI != FE; ++FI)
>>> +        Changed |= runOnMachineBasicBlock(*FI);
>>> +      return Changed;
>>> +    }
>>> +
>>> +  };
>>> +  char Filler::ID = 0;
>>> +} // end of anonymous namespace
>>> +
>>> +/// runOnMachineBasicBlock - Fill in delay slots for the given
>>> basic block.
>>> +/// Currently, we fill delay slots with NOPs. We assume there is
>>> only one
>>> +/// delay slot per delayed instruction.
>>> +bool Filler::
>>> +runOnMachineBasicBlock(MachineBasicBlock &MBB)
>>> +{
>>> +  bool Changed = false;
>>> +  for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end();
>>> ++I)
>>> +    if (TII->hasDelaySlot(I->getOpcode())) {
>>> +      MachineBasicBlock::iterator J = I;
>>> +      ++J;
>>> +      BuildMI(MBB, J, TII->get(Mips::NOP));
>>> +      ++FilledSlots;
>>> +      Changed = true;
>>> +    }
>>> +  return Changed;
>>> +}
>>> +
>>> +/// createMipsDelaySlotFillerPass - Returns a pass that fills in
>>> delay
>>> +/// slots in Mips MachineFunctions
>>> +FunctionPass *llvm::createMipsDelaySlotFillerPass(MipsTargetMachine
>>> &tm) {
>>> +  return new Filler(tm);
>>> +}
>>> +
>>>
>>>
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>>
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>
>
> -- 
> Bruno Cardoso Lopes
> http://www.brunocardoso.org
>
> "The Man in Black fled across the desert and the gunslinger followed"
>   - Childe Roland to the Dark Tower Came
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