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