llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp

//===-- AMDGPUInstrInfo.cpp - Base class for AMD GPU InstrInfo ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief Implementation of the TargetInstrInfo class that is common to all
/// AMD GPUs.
//
//===----------------------------------------------------------------------===//

#include "AMDGPUInstrInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Value.h"

using namespace llvm;

Intrinsic::ID AMDGPU::getIntrinsicID(const MachineInstr &I) {
  return I.getOperand(I.getNumExplicitDefs()).getIntrinsicID();
}

// TODO: Should largely merge with AMDGPUTTIImpl::isSourceOfDivergence.
bool AMDGPU::isUniformMMO(const MachineMemOperand *MMO) {
  const Value *Ptr = MMO->getValue();
  if (!Ptr) {
    if (const PseudoSourceValue *PSV = MMO->getPseudoValue()) {
      return PSV->isConstantPool() || PSV->isStack() || PSV->isGOT() ||
             PSV->isJumpTable();
    }

    // Unknown value.
    return false;
  }

  // UndefValue means this is a load of a kernel input.  These are uniform.
  // Sometimes LDS instructions have constant pointers.
  if (isa<UndefValue, Constant, GlobalValue>(Ptr))
    return true;

  if (MMO->getAddrSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
    return true;

  if (const Argument *Arg = dyn_cast<Argument>(Ptr))
    return AMDGPU::isArgPassedInSGPR(Arg);

  const Instruction *I = dyn_cast<Instruction>(Ptr);
  return I && I->getMetadata("amdgpu.uniform");
}