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e693cbf9f5
This is the first in a series of patches that attempts to migrate existing cost instructions to return a new InstructionCost class in place of a simple integer. This new class is intended to be as light-weight and simple as possible, with a full range of arithmetic and comparison operators that largely mirror the same sets of operations on basic types, such as integers. The main advantage to using an InstructionCost is that it can encode a particular cost state in addition to a value. The initial implementation only has two states - Normal and Invalid - but these could be expanded over time if necessary. An invalid state can be used to represent an unknown cost or an instruction that is prohibitively expensive. This patch adds the new class and changes the getInstructionCost interface to return the new class. Other cost functions, such as getUserCost, etc., will be migrated in future patches as I believe this to be less disruptive. One benefit of this new class is that it provides a way to unify many of the magic costs in the codebase where the cost is set to a deliberately high number to prevent optimisations taking place, e.g. vectorization. It also provides a route to represent the extremely high, and unknown, cost of scalarization of scalable vectors, which is not currently supported. Differential Revision: https://reviews.llvm.org/D91174
25 lines
854 B
C++
25 lines
854 B
C++
//===- InstructionCost.cpp --------------------------------------*- 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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/// \file
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/// This file includes the function definitions for the InstructionCost class
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/// that is used when calculating the cost of an instruction, or a group of
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/// instructions.
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/InstructionCost.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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void InstructionCost::print(raw_ostream &OS) const {
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if (isValid())
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OS << Value;
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else
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OS << "Invalid";
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}
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