You've already forked linux-packaging-mono
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
//===--- AMDGPUMacroFusion.cpp - AMDGPU Macro Fusion ----------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
/// \file This file contains the AMDGPU implementation of the DAG scheduling
|
|
/// mutation to pair instructions back to back.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AMDGPUMacroFusion.h"
|
|
#include "AMDGPUSubtarget.h"
|
|
#include "SIInstrInfo.h"
|
|
|
|
#include "llvm/CodeGen/MacroFusion.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
/// \brief Check if the instr pair, FirstMI and SecondMI, should be fused
|
|
/// together. Given SecondMI, when FirstMI is unspecified, then check if
|
|
/// SecondMI may be part of a fused pair at all.
|
|
static bool shouldScheduleAdjacent(const TargetInstrInfo &TII_,
|
|
const TargetSubtargetInfo &TSI,
|
|
const MachineInstr *FirstMI,
|
|
const MachineInstr &SecondMI) {
|
|
const SIInstrInfo &TII = static_cast<const SIInstrInfo&>(TII_);
|
|
|
|
switch (SecondMI.getOpcode()) {
|
|
case AMDGPU::V_ADDC_U32_e64:
|
|
case AMDGPU::V_SUBB_U32_e64:
|
|
case AMDGPU::V_CNDMASK_B32_e64: {
|
|
// Try to cluster defs of condition registers to their uses. This improves
|
|
// the chance VCC will be available which will allow shrinking to VOP2
|
|
// encodings.
|
|
if (!FirstMI)
|
|
return true;
|
|
|
|
const MachineOperand *Src2 = TII.getNamedOperand(SecondMI,
|
|
AMDGPU::OpName::src2);
|
|
return FirstMI->definesRegister(Src2->getReg());
|
|
}
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
} // end namespace
|
|
|
|
|
|
namespace llvm {
|
|
|
|
std::unique_ptr<ScheduleDAGMutation> createAMDGPUMacroFusionDAGMutation () {
|
|
return createMacroFusionDAGMutation(shouldScheduleAdjacent);
|
|
}
|
|
|
|
} // end namespace llvm
|