| //===-- GuardUtils.h - Utils for work with guards ---------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // Utils that are used to perform transformations related to guards and their |
| // conditions. |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TRANSFORMS_UTILS_GUARDUTILS_H |
| #define LLVM_TRANSFORMS_UTILS_GUARDUTILS_H |
| |
| namespace llvm { |
| |
| class BranchInst; |
| class CallInst; |
| class Function; |
| class Value; |
| |
| /// Splits control flow at point of \p Guard, replacing it with explicit branch |
| /// by the condition of guard's first argument. The taken branch then goes to |
| /// the block that contains \p Guard's successors, and the non-taken branch |
| /// goes to a newly-created deopt block that contains a sole call of the |
| /// deoptimize function \p DeoptIntrinsic. If 'UseWC' is set, preserve the |
| /// widenable nature of the guard by lowering to equivelent form. If not set, |
| /// lower to a form without widenable semantics. |
| void makeGuardControlFlowExplicit(Function *DeoptIntrinsic, CallInst *Guard, |
| bool UseWC); |
| |
| /// Given a branch we know is widenable (defined per Analysis/GuardUtils.h), |
| /// widen it such that condition 'NewCond' is also known to hold on the taken |
| /// path. Branch remains widenable after transform. |
| void widenWidenableBranch(BranchInst *WidenableBR, Value *NewCond); |
| |
| /// Given a branch we know is widenable (defined per Analysis/GuardUtils.h), |
| /// *set* it's condition such that (only) 'Cond' is known to hold on the taken |
| /// path and that the branch remains widenable after transform. |
| void setWidenableBranchCond(BranchInst *WidenableBR, Value *Cond); |
| |
| } // llvm |
| |
| #endif // LLVM_TRANSFORMS_UTILS_GUARDUTILS_H |