| 1 | //===- ConvergenceVerifier.cpp - Verify convergence control -----*- C++ -*-===// |
|---|---|
| 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 "llvm/IR/ConvergenceVerifier.h" |
| 10 | #include "llvm/IR/Dominators.h" |
| 11 | #include "llvm/IR/GenericConvergenceVerifierImpl.h" |
| 12 | #include "llvm/IR/Instructions.h" |
| 13 | #include "llvm/IR/SSAContext.h" |
| 14 | |
| 15 | using namespace llvm; |
| 16 | |
| 17 | template <> |
| 18 | auto GenericConvergenceVerifier<SSAContext>::getConvOp(const Instruction &I) |
| 19 | -> ConvOpKind { |
| 20 | const auto *CB = dyn_cast<CallBase>(Val: &I); |
| 21 | if (!CB) |
| 22 | return CONV_NONE; |
| 23 | switch (CB->getIntrinsicID()) { |
| 24 | default: |
| 25 | return CONV_NONE; |
| 26 | case Intrinsic::experimental_convergence_anchor: |
| 27 | return CONV_ANCHOR; |
| 28 | case Intrinsic::experimental_convergence_entry: |
| 29 | return CONV_ENTRY; |
| 30 | case Intrinsic::experimental_convergence_loop: |
| 31 | return CONV_LOOP; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | template <> |
| 36 | void GenericConvergenceVerifier<SSAContext>::checkConvergenceTokenProduced( |
| 37 | const Instruction &I) { |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | template <> |
| 42 | const Instruction * |
| 43 | GenericConvergenceVerifier<SSAContext>::findAndCheckConvergenceTokenUsed( |
| 44 | const Instruction &I) { |
| 45 | auto *CB = dyn_cast<CallBase>(Val: &I); |
| 46 | if (!CB) |
| 47 | return nullptr; |
| 48 | |
| 49 | unsigned Count = |
| 50 | CB->countOperandBundlesOfType(ID: LLVMContext::OB_convergencectrl); |
| 51 | CheckOrNull(Count <= 1, |
| 52 | "The 'convergencectrl' bundle can occur at most once on a call", |
| 53 | {Context.print(CB)}); |
| 54 | if (!Count) |
| 55 | return nullptr; |
| 56 | |
| 57 | auto Bundle = CB->getOperandBundle(ID: LLVMContext::OB_convergencectrl); |
| 58 | CheckOrNull(Bundle->Inputs.size() == 1 && |
| 59 | Bundle->Inputs[0]->getType()->isTokenTy(), |
| 60 | "The 'convergencectrl' bundle requires exactly one token use.", |
| 61 | {Context.print(CB)}); |
| 62 | auto *Token = Bundle->Inputs[0].get(); |
| 63 | auto *Def = dyn_cast<Instruction>(Val: Token); |
| 64 | |
| 65 | CheckOrNull(Def && getConvOp(*Def) != CONV_NONE, |
| 66 | "Convergence control tokens can only be produced by calls to the " |
| 67 | "convergence control intrinsics.", |
| 68 | {Context.print(Token), Context.print(&I)}); |
| 69 | |
| 70 | if (Def) |
| 71 | Tokens[&I] = Def; |
| 72 | |
| 73 | return Def; |
| 74 | } |
| 75 | |
| 76 | template <> |
| 77 | bool GenericConvergenceVerifier<SSAContext>::isInsideConvergentFunction( |
| 78 | const Instruction &I) { |
| 79 | auto *F = I.getFunction(); |
| 80 | return F->isConvergent(); |
| 81 | } |
| 82 | |
| 83 | template <> |
| 84 | bool GenericConvergenceVerifier<SSAContext>::isConvergent( |
| 85 | const Instruction &I) { |
| 86 | if (auto *CB = dyn_cast<CallBase>(Val: &I)) { |
| 87 | return CB->isConvergent(); |
| 88 | } |
| 89 | return false; |
| 90 | } |
| 91 | |
| 92 | template class llvm::GenericConvergenceVerifier<SSAContext>; |
| 93 |