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Summary: Currently, we only have nice exploration for LEA instruction, while for the rest, we rely on `randomizeUnsetVariables()` to sometimes generate something interesting. While that works, it isn't very reliable in coverage :) Here, i'm making an assumption that while we may want to explore multi-instruction configs, we are most interested in the characteristics of the main instruction we were asked about. Which we can do, by taking the existing `randomizeMCOperand()`, and turning it on it's head - instead of relying on it to randomly fill one of the interesting values, let's pregenerate all the possible interesting values for the variable, and then generate as much `InstructionTemplate` combinations of these possible values for variables as needed/possible. Of course, that requires invasive changes to no longer pass just the naked `Instruction`, but sometimes partially filled `InstructionTemplate`. As it can be seen from the test, this allows us to explore `X86::OperandType::OPERAND_COND_CODE` for instructions that take such an operand. I'm hoping this will greatly simplify exploration. Reviewers: courbet, gchatelet Reviewed By: gchatelet Subscribers: orodley, mgorny, sdardis, tschuett, jrtc27, atanasyan, mstojanovic, andreadb, RKSimon, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74156
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
//===-- SerialSnippetGenerator.h --------------------------------*- 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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///
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/// \file
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/// A SnippetGenerator implementation to create serial instruction snippets.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_SERIALSNIPPETGENERATOR_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_SERIALSNIPPETGENERATOR_H
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#include "Error.h"
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#include "MCInstrDescView.h"
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#include "SnippetGenerator.h"
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namespace llvm {
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namespace exegesis {
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class SerialSnippetGenerator : public SnippetGenerator {
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public:
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using SnippetGenerator::SnippetGenerator;
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~SerialSnippetGenerator() override;
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Expected<std::vector<CodeTemplate>>
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generateCodeTemplates(InstructionTemplate Variant,
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const BitVector &ForbiddenRegisters) const override;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_SERIALSNIPPETGENERATOR_H
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