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cbfd406541
Move a bunch of (now) private stuff from ConstantFolding.h into ConstantFolding.cpp. This _finally_ gets us to a place where we have a sane constant folder. The rules are: 1. LLVM clients now use ConstantExpr::get* methods to fold constants. If they cannot be folded, a constantexpr is created, so these methods always return valid Constant*'s. 2. The implementation of ConstantExpr::get* uses the functions exposed by ConstantFolding.h to try to fold constants. If they cannot be folded, they should return a null pointer. 3. The implementation of ConstantFolding can do whatever it wants, and only has one client (Constants.cpp) This cuts down on the wierd dependencies, and eliminates the two interfaces. The old constanthandling interface was especially bad for clients to use because almost none of them took the failure condition into consideration, thus leading to obscure problems. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10807 91177308-0d34-0410-b5e6-96231b3b80d8
37 lines
1.3 KiB
C++
37 lines
1.3 KiB
C++
//===-- ConstantFolding.h - Internal Constant Folding Interface -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the (internal) constant folding interfaces for LLVM. These
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// interfaces are used by the ConstantExpr::get* methods to automatically fold
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// constants when possible.
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//
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// These operators may return a null object if I don't know how to perform the
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// specified operation on the specified constant types.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CONSTANTFOLDING_H
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#define CONSTANTFOLDING_H
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#include <vector>
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namespace llvm {
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class Constant;
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class Type;
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// Constant fold various types of instruction...
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Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy);
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Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
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const Constant *V2);
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Constant *ConstantFoldGetElementPtr(const Constant *C,
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const std::vector<Constant*> &IdxList);
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} // End llvm namespace
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#endif
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