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      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 }
     50