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/MachineInstr.h"
18 #include "llvm/CodeGen/MachineMemOperand.h"
19 #include "llvm/IR/Constants.h"
20 #include "llvm/IR/Instruction.h"
21 #include "llvm/IR/Value.h"
22 
23 using namespace llvm;
24 
25 // Pin the vtable to this file.
26 //void AMDGPUInstrInfo::anchor() {}
27 
28 AMDGPUInstrInfo::AMDGPUInstrInfo(const GCNSubtarget &ST) { }
29 
30 Intrinsic::ID AMDGPU::getIntrinsicID(const MachineInstr &I) {
31   return I.getOperand(I.getNumExplicitDefs()).getIntrinsicID();
32 }
33 
34 // TODO: Should largely merge with AMDGPUTTIImpl::isSourceOfDivergence.
35 bool AMDGPUInstrInfo::isUniformMMO(const MachineMemOperand *MMO) {
36   const Value *Ptr = MMO->getValue();
37   // UndefValue means this is a load of a kernel input.  These are uniform.
38   // Sometimes LDS instructions have constant pointers.
39   // If Ptr is null, then that means this mem operand contains a
40   // PseudoSourceValue like GOT.
41   if (!Ptr || isa<UndefValue>(Ptr) ||
42       isa<Constant>(Ptr) || isa<GlobalValue>(Ptr))
43     return true;
44 
45   if (MMO->getAddrSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
46     return true;
47 
48   if (const Argument *Arg = dyn_cast<Argument>(Ptr))
49     return AMDGPU::isArgPassedInSGPR(Arg);
50 
51   const Instruction *I = dyn_cast<Instruction>(Ptr);
52   return I && I->getMetadata("amdgpu.uniform");
53 }
54