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//===-- PTXFPRoundingModePass.cpp - Assign rounding modes pass ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a machine function pass that sets appropriate FP rounding
// modes for all relevant instructions.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "ptx-fp-rounding-mode"
#include "PTX.h"
#include "PTXTargetMachine.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
// NOTE: PTXFPRoundingModePass should be executed just before emission.
namespace {
/// PTXFPRoundingModePass - Pass to assign appropriate FP rounding modes to
/// all FP instructions. Essentially, this pass just looks for all FP
/// instructions that have a rounding mode set to RndDefault, and sets an
/// appropriate rounding mode based on the target device.
///
class PTXFPRoundingModePass : public MachineFunctionPass {
private:
static char ID;
typedef std::pair<unsigned, unsigned> RndModeDesc;
PTXTargetMachine& TargetMachine;
DenseMap<unsigned, RndModeDesc> Instrs;
public:
PTXFPRoundingModePass(PTXTargetMachine &TM, CodeGenOpt::Level OptLevel)
: MachineFunctionPass(ID),
TargetMachine(TM) {
initializeMap();
}
virtual bool runOnMachineFunction(MachineFunction &MF);
virtual const char *getPassName() const {
return "PTX FP Rounding Mode Pass";
}
private:
void initializeMap();
void processInstruction(MachineInstr &MI);
}; // class PTXFPRoundingModePass
} // end anonymous namespace
using namespace llvm;
char PTXFPRoundingModePass::ID = 0;
bool PTXFPRoundingModePass::runOnMachineFunction(MachineFunction &MF) {
// Look at each basic block
for (MachineFunction::iterator bbi = MF.begin(), bbe = MF.end(); bbi != bbe;
++bbi) {
MachineBasicBlock &MBB = *bbi;
// Look at each instruction
for (MachineBasicBlock::iterator ii = MBB.begin(), ie = MBB.end();
ii != ie; ++ii) {
MachineInstr &MI = *ii;
processInstruction(MI);
}
}
return false;
}
void PTXFPRoundingModePass::initializeMap() {
using namespace PTXRoundingMode;
const PTXSubtarget& ST = TargetMachine.getSubtarget<PTXSubtarget>();
// Build a map of default rounding mode for all instructions that need a
// rounding mode.
Instrs[PTX::FADDrr32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FADDri32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FADDrr64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FADDri64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSUBrr32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSUBri32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSUBrr64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSUBri64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FMULrr32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FMULri32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FMULrr64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FMULri64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FNEGrr32] = std::make_pair(1U, (unsigned)RndNone);
Instrs[PTX::FNEGri32] = std::make_pair(1U, (unsigned)RndNone);
Instrs[PTX::FNEGrr64] = std::make_pair(1U, (unsigned)RndNone);
Instrs[PTX::FNEGri64] = std::make_pair(1U, (unsigned)RndNone);
unsigned FDivRndMode = ST.fdivNeedsRoundingMode() ? RndNearestEven : RndNone;
Instrs[PTX::FDIVrr32] = std::make_pair(1U, FDivRndMode);
Instrs[PTX::FDIVri32] = std::make_pair(1U, FDivRndMode);
Instrs[PTX::FDIVrr64] = std::make_pair(1U, FDivRndMode);
Instrs[PTX::FDIVri64] = std::make_pair(1U, FDivRndMode);
unsigned FMADRndMode = ST.fmadNeedsRoundingMode() ? RndNearestEven : RndNone;
Instrs[PTX::FMADrrr32] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FMADrri32] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FMADrii32] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FMADrrr64] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FMADrri64] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FMADrii64] = std::make_pair(1U, FMADRndMode);
Instrs[PTX::FSQRTrr32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSQRTri32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSQRTrr64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSQRTri64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::FSINrr32] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FSINri32] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FSINrr64] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FSINri64] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FCOSrr32] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FCOSri32] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FCOSrr64] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::FCOSri64] = std::make_pair(1U, (unsigned)RndApprox);
Instrs[PTX::CVTu16f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs16f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTu16f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs16f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTu32f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs32f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTu32f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs32f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTu64f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs64f32] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTu64f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTs64f64] = std::make_pair(1U, (unsigned)RndTowardsZeroInt);
Instrs[PTX::CVTf32u16] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32s16] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32u32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32s32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32u64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32s64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf32f64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64u16] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64s16] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64u32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64s32] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64u64] = std::make_pair(1U, (unsigned)RndNearestEven);
Instrs[PTX::CVTf64s64] = std::make_pair(1U, (unsigned)RndNearestEven);
}
void PTXFPRoundingModePass::processInstruction(MachineInstr &MI) {
// Is this an instruction that needs a rounding mode?
if (Instrs.count(MI.getOpcode())) {
const RndModeDesc &Desc = Instrs[MI.getOpcode()];
// Get the rounding mode operand
MachineOperand &Op = MI.getOperand(Desc.first);
// Update the rounding mode if needed
if (Op.getImm() == PTXRoundingMode::RndDefault) {
Op.setImm(Desc.second);
}
}
}
FunctionPass *llvm::createPTXFPRoundingModePass(PTXTargetMachine &TM,
CodeGenOpt::Level OptLevel) {
return new PTXFPRoundingModePass(TM, OptLevel);
}
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