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1bf9d7e37d
This patch makes sure shift instructions such as this one:
%result = shl i32 %n, %amount
are expanded just before the IR to SelectionDAG conversion to a loop so
that calls to non-existing library functions such as __ashlsi3 are
avoided. The generated code is currently pretty bad but there's a lot of
room for improvement: the shift itself can be done in just four
instructions.
Differential Revision: https://reviews.llvm.org/D96677
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
//===-- AVR.h - Top-level interface for AVR representation ------*- 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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//
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// This file contains the entry points for global functions defined in the LLVM
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// AVR back-end.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_AVR_H
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#define LLVM_AVR_H
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include "llvm/Target/TargetMachine.h"
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namespace llvm {
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class AVRTargetMachine;
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class FunctionPass;
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Pass *createAVRShiftExpandPass();
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FunctionPass *createAVRISelDag(AVRTargetMachine &TM,
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CodeGenOpt::Level OptLevel);
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FunctionPass *createAVRExpandPseudoPass();
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FunctionPass *createAVRFrameAnalyzerPass();
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FunctionPass *createAVRRelaxMemPass();
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FunctionPass *createAVRDynAllocaSRPass();
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FunctionPass *createAVRBranchSelectionPass();
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void initializeAVRShiftExpandPass(PassRegistry &);
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void initializeAVRExpandPseudoPass(PassRegistry&);
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void initializeAVRRelaxMemPass(PassRegistry&);
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/// Contains the AVR backend.
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namespace AVR {
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/// An integer that identifies all of the supported AVR address spaces.
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enum AddressSpace { DataMemory, ProgramMemory };
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/// Checks if a given type is a pointer to program memory.
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template <typename T> bool isProgramMemoryAddress(T *V) {
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return cast<PointerType>(V->getType())->getAddressSpace() == ProgramMemory;
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}
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inline bool isProgramMemoryAccess(MemSDNode const *N) {
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auto V = N->getMemOperand()->getValue();
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return (V != nullptr) ? isProgramMemoryAddress(V) : false;
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}
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} // end of namespace AVR
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} // end namespace llvm
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#endif // LLVM_AVR_H
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