lib/Target/AMDGPU/AMDGPUMachineFunction.cpp

   1 //===-- AMDGPUMachineFunctionInfo.cpp ---------------------------------------=//
   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 #include "AMDGPUMachineFunction.h"
  10 #include "AMDGPUSubtarget.h"
  11 #include "AMDGPUPerfHintAnalysis.h"
  12 #include "llvm/CodeGen/MachineModuleInfo.h"
  13
  14 using namespace llvm;
  15
  16 AMDGPUMachineFunction::AMDGPUMachineFunction(const MachineFunction &MF) :
  17   MachineFunctionInfo(),
  18   LocalMemoryObjects(),
  19   ExplicitKernArgSize(0),
  20   LDSSize(0),
  21   IsEntryFunction(AMDGPU::isEntryFunctionCC(MF.getFunction().getCallingConv())),
  22   NoSignedZerosFPMath(MF.getTarget().Options.NoSignedZerosFPMath),
  23   MemoryBound(false),
  24   WaveLimiter(false) {
  25   const AMDGPUSubtarget &ST = AMDGPUSubtarget::get(MF);
  26
  27   // FIXME: Should initialize KernArgSize based on ExplicitKernelArgOffset,
  28   // except reserved size is not correctly aligned.
  29   const Function &F = MF.getFunction();
  30
  31   Attribute MemBoundAttr = F.getFnAttribute("amdgpu-memory-bound");
  32   MemoryBound = MemBoundAttr.isStringAttribute() &&
  33                 MemBoundAttr.getValueAsString() == "true";
  34
  35   Attribute WaveLimitAttr = F.getFnAttribute("amdgpu-wave-limiter");
  36   WaveLimiter = WaveLimitAttr.isStringAttribute() &&
  37                 WaveLimitAttr.getValueAsString() == "true";
  38
  39   CallingConv::ID CC = F.getCallingConv();
  40   if (CC == CallingConv::AMDGPU_KERNEL || CC == CallingConv::SPIR_KERNEL)
  41     ExplicitKernArgSize = ST.getExplicitKernArgSize(F, MaxKernArgAlign);
  42 }
  43
  44 unsigned AMDGPUMachineFunction::allocateLDSGlobal(const DataLayout &DL,
  45                                                   const GlobalValue &GV) {
  46   auto Entry = LocalMemoryObjects.insert(std::make_pair(&GV, 0));
  47   if (!Entry.second)
  48     return Entry.first->second;
  49
  50   unsigned Align = GV.getAlignment();
  51   if (Align == 0)
  52     Align = DL.getABITypeAlignment(GV.getValueType());
  53
  54   /// TODO: We should sort these to minimize wasted space due to alignment
  55   /// padding. Currently the padding is decided by the first encountered use
  56   /// during lowering.
  57   unsigned Offset = LDSSize = alignTo(LDSSize, Align);
  58
  59   Entry.first->second = Offset;
  60   LDSSize += DL.getTypeAllocSize(GV.getValueType());
  61
  62   return Offset;
  63 }