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This patch factors out the main code transformation utilities in the pgo-driven indirect call promotion pass and places them in Transforms/Utils. The change is intended to be a non-functional change, letting non-pgo-driven passes share a common implementation with the existing pgo-driven pass. The common utilities are used to conditionally promote indirect call sites to direct call sites. They perform the underlying transformation, and do not consider profile information. The pgo-specific details (e.g., the computation of branch weight metadata) have been left in the indirect call promotion pass. Differential Revision: https://reviews.llvm.org/D40658 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319963 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.8 KiB
C++
45 lines
1.8 KiB
C++
//===- CallPromotionUtils.h - Utilities for call promotion ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares utilities useful for promoting indirect call sites to
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// direct call sites.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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#define LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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#include "llvm/IR/CallSite.h"
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namespace llvm {
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/// Return true if the given indirect call site can be made to call \p Callee.
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///
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/// This function ensures that the number and type of the call site's arguments
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/// and return value match those of the given function. If the types do not
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/// match exactly, they must at least be bitcast compatible. If \p FailureReason
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/// is non-null and the indirect call cannot be promoted, the failure reason
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/// will be stored in it.
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bool isLegalToPromote(CallSite CS, Function *Callee,
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const char **FailureReason = nullptr);
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/// Promote the given indirect call site to conditionally call \p Callee.
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///
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/// This function creates an if-then-else structure at the location of the call
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/// site. The original call site is promoted and moved into the "then" block. A
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/// clone of the indirect call site is placed in the "else" block and returned.
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/// If \p BranchWeights is non-null, it will be used to set !prof metadata on
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/// the new conditional branch.
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Instruction *promoteCallWithIfThenElse(CallSite CS, Function *Callee,
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MDNode *BranchWeights = nullptr);
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_CALLPROMOTIONUTILS_H
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