llvm/lib/Target/AMDGPU/AMDGPUInstrInfo.cpp

   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 "AMDGPU.h"
  17 #include "llvm/CodeGen/MachineMemOperand.h"
  18 #include "llvm/IR/Constants.h"
  19 #include "llvm/IR/Instruction.h"
  20 #include "llvm/IR/Value.h"
  21
  22 using namespace llvm;
  23
  24 // Pin the vtable to this file.
  25 //void AMDGPUInstrInfo::anchor() {}
  26
  27 AMDGPUInstrInfo::AMDGPUInstrInfo(const GCNSubtarget &ST) { }
  28
  29
  30 // TODO: Should largely merge with AMDGPUTTIImpl::isSourceOfDivergence.
  31 bool 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 }