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If we're about to emit something like: 

%f0 = fmovs %f0
  %f1 = fmovs %f1

then just delete the FpMOVD pseudo-instruction instead.  Also, add
statistics and debug printouts.

llvm-svn: 18383
This commit is contained in:
Brian Gaeke 2004-11-30 08:15:15 +00:00
parent 105d4152d7
commit 1d6b926ab6
1 changed files with 25 additions and 13 deletions
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38
llvm/lib/Target/SparcV8/FPMover.cpp
View File

@ -15,11 +15,13 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
namespace {
Statistic<> NumFpMOVDs ("fpmover", "# FpMOVD instructions translated");
Statistic<> SkippedFpMOVDs ("fpmover", "# FpMOVD instructions skipped");
struct FPMover : public MachineFunctionPass {
/// Target machine description which we query for reg. names, data
@ -70,21 +72,31 @@ static void doubleToSingleRegPair(unsigned doubleReg, unsigned &singleReg1, unsi
bool FPMover::runOnMachineBasicBlock (MachineBasicBlock &MBB) {
bool Changed = false;
for (MachineBasicBlock::iterator I = MBB.begin (); I != MBB.end (); ++I)
if (V8::FpMOVD == I->getOpcode()) {
I->setOpcode (V8::FMOVS);
unsigned DestReg = I->getOperand(0).getReg();
unsigned SrcReg = I->getOperand(1).getReg();
unsigned NewSrcReg0, NewSrcReg1;
unsigned NewDestReg0, NewDestReg1;
doubleToSingleRegPair (DestReg, NewDestReg0, NewDestReg1);
doubleToSingleRegPair (SrcReg, NewSrcReg0, NewSrcReg1);
I->SetMachineOperandReg (0, NewDestReg0);
I->SetMachineOperandReg (1, NewSrcReg0);
// Insert copy for the other half of the double:
if (V8::FpMOVD == I->getOpcode ()) {
unsigned NewSrcReg0, NewSrcReg1, NewDestReg0, NewDestReg1;
doubleToSingleRegPair (I->getOperand (0).getReg (), NewDestReg0,
NewDestReg1);
doubleToSingleRegPair (I->getOperand (1).getReg (), NewSrcReg0,
NewSrcReg1);
MachineBasicBlock::iterator J = I;
++J;
BuildMI (MBB, J, V8::FMOVS, 1, NewDestReg1).addReg(NewSrcReg1);
++NumFpMOVDs;
if (!(NewDestReg0 == NewSrcReg0 && NewDestReg1 == NewSrcReg1)) {
I->setOpcode (V8::FMOVS);
I->SetMachineOperandReg (0, NewDestReg0);
I->SetMachineOperandReg (1, NewSrcReg0);
DEBUG (std::cerr << "FPMover: new dest reg. is: " << NewDestReg0
<< "; modified instr is: " << *I);
// Insert copy for the other half of the double:
MachineInstr *MI2 =
BuildMI (MBB, J, V8::FMOVS, 1, NewDestReg1).addReg (NewSrcReg1);
DEBUG (std::cerr << "FPMover: new dest reg. is " << NewDestReg1
<< "; inserted instr is: " << *MI2);
++NumFpMOVDs;
} else {
MBB.erase (I);
++SkippedFpMOVDs;
}
I = J;
Changed = true;
}
return Changed;