1//===-- AMDGPUInstrInfo.cpp - Base class for AMD GPU InstrInfo ------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// \brief Implementation of the TargetInstrInfo class that is common to all
11/// AMD GPUs.
12//
13//===----------------------------------------------------------------------===//
14
15#include "AMDGPUInstrInfo.h"
16#include "AMDGPUTargetMachine.h"
17#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
18#include "llvm/CodeGen/MachineFrameInfo.h"
19#include "llvm/CodeGen/MachineInstrBuilder.h"
20#include "llvm/CodeGen/MachineRegisterInfo.h"
21
22using namespace llvm;
23
24// Pin the vtable to this file.
25//void AMDGPUInstrInfo::anchor() {}
26
27AMDGPUInstrInfo::AMDGPUInstrInfo(const GCNSubtarget &ST) { }
28
29
30// TODO: Should largely merge with AMDGPUTTIImpl::isSourceOfDivergence.
31bool AMDGPUInstrInfo::isUniformMMO(const MachineMemOperand *MMO) {
32  const Value *Ptr = MMO->getValue();
33  // UndefValue means this is a load of a kernel input.  These are uniform.
34  // Sometimes LDS instructions have constant pointers.
35  // If Ptr is null, then that means this mem operand contains a
36  // PseudoSourceValue like GOT.
37  if (!Ptr || isa<UndefValue>(Ptr) ||
38      isa<Constant>(Ptr) || isa<GlobalValue>(Ptr))
39    return true;
40
41  if (MMO->getAddrSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
42    return true;
43
44  if (const Argument *Arg = dyn_cast<Argument>(Ptr))
45    return AMDGPU::isArgPassedInSGPR(Arg);
46
47  const Instruction *I = dyn_cast<Instruction>(Ptr);
48  return I && I->getMetadata("amdgpu.uniform");
49}
50