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//===- ConvergenceVerifier.cpp - Verify convergence control -----*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/ConvergenceVerifier.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/GenericConvergenceVerifierImpl.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/SSAContext.h"
using namespace llvm;
template <>
auto GenericConvergenceVerifier<SSAContext>::getConvOp(const Instruction &I)
-> ConvOpKind {
const auto *CB = dyn_cast<CallBase>(&I);
if (!CB)
return CONV_NONE;
switch (CB->getIntrinsicID()) {
default:
return CONV_NONE;
case Intrinsic::experimental_convergence_anchor:
return CONV_ANCHOR;
case Intrinsic::experimental_convergence_entry:
return CONV_ENTRY;
case Intrinsic::experimental_convergence_loop:
return CONV_LOOP;
}
}
template <>
void GenericConvergenceVerifier<SSAContext>::checkConvergenceTokenProduced(
const Instruction &I) {}
template <>
const Instruction *
GenericConvergenceVerifier<SSAContext>::findAndCheckConvergenceTokenUsed(
const Instruction &I) {
auto *CB = dyn_cast<CallBase>(&I);
if (!CB)
return nullptr;
unsigned Count =
CB->countOperandBundlesOfType(LLVMContext::OB_convergencectrl);
CheckOrNull(Count <= 1,
"The 'convergencectrl' bundle can occur at most once on a call",
{Context.print(CB)});
if (!Count)
return nullptr;
auto Bundle = CB->getOperandBundle(LLVMContext::OB_convergencectrl);
CheckOrNull(Bundle->Inputs.size() == 1 &&
Bundle->Inputs[0]->getType()->isTokenTy(),
"The 'convergencectrl' bundle requires exactly one token use.",
{Context.print(CB)});
auto *Token = Bundle->Inputs[0].get();
auto *Def = dyn_cast<Instruction>(Token);
CheckOrNull(Def && getConvOp(*Def) != CONV_NONE,
"Convergence control tokens can only be produced by calls to the "
"convergence control intrinsics.",
{Context.print(Token), Context.print(&I)});
if (Def)
Tokens[&I] = Def;
return Def;
}
template <>
bool GenericConvergenceVerifier<SSAContext>::isInsideConvergentFunction(
const Instruction &I) {
auto *F = I.getFunction();
return F->isConvergent();
}
template <>
bool GenericConvergenceVerifier<SSAContext>::isConvergent(
const Instruction &I) {
if (auto *CB = dyn_cast<CallBase>(&I)) {
return CB->isConvergent();
}
return false;
}
template class llvm::GenericConvergenceVerifier<SSAContext>;
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