75 lines
3.0 KiB
C++
75 lines
3.0 KiB
C++
//===-- GuardUtils.h - Utils for work with guards ---------------*- 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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// Utils that are used to perform analyzes related to guards and their
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// conditions.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_GUARDUTILS_H
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#define LLVM_ANALYSIS_GUARDUTILS_H
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class BasicBlock;
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class Use;
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class User;
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class Value;
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template <typename T> class SmallVectorImpl;
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/// Returns true iff \p U has semantics of a guard expressed in a form of call
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/// of llvm.experimental.guard intrinsic.
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LLVM_ABI bool isGuard(const User *U);
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/// Returns true iff \p V has semantics of llvm.experimental.widenable.condition
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/// call
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LLVM_ABI bool isWidenableCondition(const Value *V);
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/// Returns true iff \p U is a widenable branch (that is,
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/// extractWidenableCondition returns widenable condition).
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LLVM_ABI bool isWidenableBranch(const User *U);
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/// Returns true iff \p U has semantics of a guard expressed in a form of a
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/// widenable conditional branch to deopt block.
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LLVM_ABI bool isGuardAsWidenableBranch(const User *U);
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/// If U is widenable branch looking like:
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/// %cond = ...
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/// %wc = call i1 @llvm.experimental.widenable.condition()
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/// %branch_cond = and i1 %cond, %wc
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/// br i1 %branch_cond, label %if_true_bb, label %if_false_bb ; <--- U
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/// The function returns true, and the values %cond and %wc and blocks
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/// %if_true_bb, if_false_bb are returned in
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/// the parameters (Condition, WidenableCondition, IfTrueBB and IfFalseFF)
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/// respectively. If \p U does not match this pattern, return false.
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LLVM_ABI bool parseWidenableBranch(const User *U, Value *&Condition,
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Value *&WidenableCondition,
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BasicBlock *&IfTrueBB,
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BasicBlock *&IfFalseBB);
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/// Analogous to the above, but return the Uses so that they can be
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/// modified. Unlike previous version, Condition is optional and may be null.
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LLVM_ABI bool parseWidenableBranch(User *U, Use *&Cond, Use *&WC,
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BasicBlock *&IfTrueBB,
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BasicBlock *&IfFalseBB);
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// The guard condition is expected to be in form of:
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// cond1 && cond2 && cond3 ...
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// or in case of widenable branch:
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// cond1 && cond2 && cond3 && widenable_contidion ...
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// Method collects the list of checks, but skips widenable_condition.
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LLVM_ABI void parseWidenableGuard(const User *U,
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llvm::SmallVectorImpl<Value *> &Checks);
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// Returns widenable_condition if it exists in the expression tree rooting from
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// \p U and has only one use.
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LLVM_ABI Value *extractWidenableCondition(const User *U);
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} // llvm
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#endif // LLVM_ANALYSIS_GUARDUTILS_H
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