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75e10dcf71
This is mostly NFC, but I removed the setting of the guard's calling convention onto the WC call. Why? Because it was untested, and was producing an ill defined output as the declaration's convention wasn't been changed leaving a mismatch which is UB.
45 lines
1.9 KiB
C++
45 lines
1.9 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 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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