d3c3c6bab5
Avoids regression which caused the revert 6d5f87fc42. This is a hack on a hack. We currently have isUniformMMO, which improperly treats unknown source value as known uniform. This is hack from before we had divergence information in the DAG, and should be removed. This is the minimum change to avoid the regression; removing the aggressive handling of the unknown case (or dropping isUniformMMO entirely) are more involved fixes.
49 lines
1.7 KiB
C++
49 lines
1.7 KiB
C++
//===-- AMDGPUInstrInfo.cpp - Base class for AMD GPU InstrInfo ------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
/// \file
|
|
/// \brief Implementation of the TargetInstrInfo class that is common to all
|
|
/// AMD GPUs.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "AMDGPUInstrInfo.h"
|
|
#include "AMDGPU.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/CodeGen/MachineMemOperand.h"
|
|
#include "llvm/IR/Constants.h"
|
|
#include "llvm/IR/Instruction.h"
|
|
#include "llvm/IR/Value.h"
|
|
|
|
using namespace llvm;
|
|
|
|
Intrinsic::ID AMDGPU::getIntrinsicID(const MachineInstr &I) {
|
|
return I.getOperand(I.getNumExplicitDefs()).getIntrinsicID();
|
|
}
|
|
|
|
// TODO: Should largely merge with AMDGPUTTIImpl::isSourceOfDivergence.
|
|
bool AMDGPU::isUniformMMO(const MachineMemOperand *MMO) {
|
|
// FIXME: null value is should be treated as unknown, not as uniform.
|
|
const Value *Ptr = MMO->getValue();
|
|
// UndefValue means this is a load of a kernel input. These are uniform.
|
|
// Sometimes LDS instructions have constant pointers.
|
|
// If Ptr is null, then that means this mem operand contains a
|
|
// PseudoSourceValue like GOT.
|
|
if (!Ptr || isa<UndefValue, Constant, GlobalValue>(Ptr))
|
|
return true;
|
|
|
|
if (MMO->getAddrSpace() == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
|
|
return true;
|
|
|
|
if (const Argument *Arg = dyn_cast<Argument>(Ptr))
|
|
return AMDGPU::isArgPassedInSGPR(Arg);
|
|
|
|
const Instruction *I = dyn_cast<Instruction>(Ptr);
|
|
return I && I->getMetadata("amdgpu.uniform");
|
|
}
|