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65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
//===--- ValueTracking.h - SIL Value Tracking Analysis ----------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains routines which analyze chains of computations.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SILOPTIMIZER_ANALYSIS_VALUETRACKING_H
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#define SWIFT_SILOPTIMIZER_ANALYSIS_VALUETRACKING_H
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#include "swift/SIL/SILArgument.h"
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#include "swift/SIL/SILInstruction.h"
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namespace swift {
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/// Returns true if \p V is a function argument which may not alias to
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/// any other pointer in the function.
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/// The \p assumeInoutIsNotAliasing specifies in no-aliasing is assumed for
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/// the @inout convention. See swift::isNotAliasedIndirectParameter().
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bool isNotAliasingArgument(SILValue V, InoutAliasingAssumption isInoutAliasing =
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InoutAliasingAssumption::Aliasing);
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/// Returns true if \p V is local inside its function. This means its underlying
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/// object either is a non-aliasing function argument or a locally allocated
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/// object.
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/// The \p assumeInoutIsNotAliasing specifies in no-aliasing is assumed for
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/// the @inout convention. See swift::isNotAliasedIndirectParameter().
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bool pointsToLocalObject(SILValue V, InoutAliasingAssumption isInoutAliasing =
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InoutAliasingAssumption::Aliasing);
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enum class IsZeroKind {
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Zero,
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NotZero,
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Unknown
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};
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/// Check if the value \p Value is known to be zero, non-zero or unknown.
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IsZeroKind isZeroValue(SILValue Value);
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/// Checks if a sign bit of a value is known to be set, not set or unknown.
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/// Essentially, it is a simple form of a range analysis.
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/// This approach is inspired by the corresponding implementation of
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/// ComputeSignBit in LLVM's value tracking implementation.
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/// It is planned to extend this approach to track all bits of a value.
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/// Therefore it can be considered to be the beginning of a range analysis
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/// infrastructure for the Swift compiler.
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Optional<bool> computeSignBit(SILValue Value);
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/// Check if execution of a given builtin instruction can result in overflows.
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/// Returns true of an overflow can happen. Otherwise returns false.
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bool canOverflow(BuiltinInst *BI);
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} // end namespace swift
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#endif // SWIFT_SILOPTIMIZER_ANALYSIS_VALUETRACKING_H
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