45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
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//===-- 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 transformations related to guards and their
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// conditions.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_GUARDUTILS_H
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#define LLVM_TRANSFORMS_UTILS_GUARDUTILS_H
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namespace llvm {
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class BranchInst;
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class CallInst;
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class Function;
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class Value;
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/// Splits control flow at point of \p Guard, replacing it with explicit branch
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/// by the condition of guard's first argument. The taken branch then goes to
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/// the block that contains \p Guard's successors, and the non-taken branch
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/// goes to a newly-created deopt block that contains a sole call of the
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/// deoptimize function \p DeoptIntrinsic. If 'UseWC' is set, preserve the
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/// widenable nature of the guard by lowering to equivelent form. If not set,
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/// lower to a form without widenable semantics.
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void makeGuardControlFlowExplicit(Function *DeoptIntrinsic, CallInst *Guard,
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bool UseWC);
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/// Given a branch we know is widenable (defined per Analysis/GuardUtils.h),
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/// widen it such that condition 'NewCond' is also known to hold on the taken
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/// path. Branch remains widenable after transform.
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void widenWidenableBranch(BranchInst *WidenableBR, Value *NewCond);
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/// Given a branch we know is widenable (defined per Analysis/GuardUtils.h),
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/// *set* it's condition such that (only) 'Cond' is known to hold on the taken
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/// path and that the branch remains widenable after transform.
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void setWidenableBranchCond(BranchInst *WidenableBR, Value *Cond);
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} // llvm
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#endif // LLVM_TRANSFORMS_UTILS_GUARDUTILS_H
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