60822637bf
This restores commit c7fdd8c11e54585dc9d15d63de9742067e0506b9. Previously reverted in f010b1bef4dda2c7082cbb41dbabf1f149cce306. LLVM function calls carry convergence control tokens as operand bundles, where the tokens themselves are produced by convergence control intrinsics. This patch implements convergence control tokens in MIR as follows: 1. Introduce target-independent ISD opcodes and MIR opcodes for convergence control intrinsics. 2. Model token values as untyped virtual registers in MIR. The change also introduces an additional ISD opcode CONVERGENCECTRL_GLUE and a corresponding machine opcode with the same spelling. This glues the convergence control token to SDNodes that represent calls to intrinsics. The glued token is later translated to an implicit argument in the MIR. The lowering of calls to user-defined functions is target-specific. On AMDGPU, the convergence control operand bundle at a non-intrinsic call is translated to an explicit argument to the SI_CALL_ISEL instruction. Post-selection adjustment converts this explicit argument to an implicit argument on the SI_CALL instruction.
93 lines
2.7 KiB
C++
93 lines
2.7 KiB
C++
//===- ConvergenceVerifier.cpp - Verify convergence control -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/ConvergenceVerifier.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/GenericConvergenceVerifierImpl.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/SSAContext.h"
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using namespace llvm;
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template <>
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auto GenericConvergenceVerifier<SSAContext>::getConvOp(const Instruction &I)
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-> ConvOpKind {
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const auto *CB = dyn_cast<CallBase>(&I);
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if (!CB)
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return CONV_NONE;
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switch (CB->getIntrinsicID()) {
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default:
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return CONV_NONE;
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case Intrinsic::experimental_convergence_anchor:
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return CONV_ANCHOR;
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case Intrinsic::experimental_convergence_entry:
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return CONV_ENTRY;
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case Intrinsic::experimental_convergence_loop:
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return CONV_LOOP;
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}
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}
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template <>
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void GenericConvergenceVerifier<SSAContext>::checkConvergenceTokenProduced(
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const Instruction &I) {
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return;
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}
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template <>
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const Instruction *
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GenericConvergenceVerifier<SSAContext>::findAndCheckConvergenceTokenUsed(
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const Instruction &I) {
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auto *CB = dyn_cast<CallBase>(&I);
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if (!CB)
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return nullptr;
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unsigned Count =
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CB->countOperandBundlesOfType(LLVMContext::OB_convergencectrl);
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CheckOrNull(Count <= 1,
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"The 'convergencectrl' bundle can occur at most once on a call",
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{Context.print(CB)});
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if (!Count)
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return nullptr;
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auto Bundle = CB->getOperandBundle(LLVMContext::OB_convergencectrl);
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CheckOrNull(Bundle->Inputs.size() == 1 &&
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Bundle->Inputs[0]->getType()->isTokenTy(),
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"The 'convergencectrl' bundle requires exactly one token use.",
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{Context.print(CB)});
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auto *Token = Bundle->Inputs[0].get();
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auto *Def = dyn_cast<Instruction>(Token);
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CheckOrNull(Def && getConvOp(*Def) != CONV_NONE,
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"Convergence control tokens can only be produced by calls to the "
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"convergence control intrinsics.",
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{Context.print(Token), Context.print(&I)});
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if (Def)
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Tokens[&I] = Def;
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return Def;
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}
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template <>
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bool GenericConvergenceVerifier<SSAContext>::isInsideConvergentFunction(
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const InstructionT &I) {
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auto *F = I.getFunction();
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return F->isConvergent();
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}
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template <>
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bool GenericConvergenceVerifier<SSAContext>::isConvergent(
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const InstructionT &I) {
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if (auto *CB = dyn_cast<CallBase>(&I)) {
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return CB->isConvergent();
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}
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return false;
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}
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template class llvm::GenericConvergenceVerifier<SSAContext>;
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