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X86FPConversionSnippet.hpp
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X86FPConversionSnippet.hpp
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/*******************************************************************************
* Copyright (c) 2000, 2019 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#ifndef IA32FPCONVERSIONSNIPPET_INCL
#define IA32FPCONVERSIONSNIPPET_INCL
#include <stdint.h>
#include "codegen/RealRegister.hpp"
#include "codegen/Snippet.hpp"
#include "il/SymbolReference.hpp"
#include "infra/Assert.hpp"
#include "x/codegen/RestartSnippet.hpp"
#include "codegen/X86Instruction.hpp"
namespace TR { class CodeGenerator; }
namespace TR { class LabelSymbol; }
namespace TR { class Node; }
namespace TR {
class X86FPConversionSnippet : public TR::X86RestartSnippet
{
TR::SymbolReference *_helperSymRef;
public:
X86FPConversionSnippet(TR::CodeGenerator *codeGen,
TR::Node *node,
TR::LabelSymbol *restartlab,
TR::LabelSymbol *snippetlab,
TR::SymbolReference *helperSymRef)
: TR::X86RestartSnippet(codeGen, node, restartlab, snippetlab, helperSymRef->canCauseGC()),
_helperSymRef(helperSymRef)
{
// The code generation for this snippet does not allow a proper GC map
// to be built, so assert that GC will not happen.
//
TR_ASSERT(!helperSymRef->canCauseGC(), "assertion failure");
}
TR::SymbolReference *getHelperSymRef() {return _helperSymRef;}
TR::SymbolReference *setHelperSymRef(TR::SymbolReference *s) {return (_helperSymRef = s);}
uint8_t *emitCallToConversionHelper(uint8_t *buffer);
virtual uint8_t *emitSnippetBody();
virtual uint8_t *genFPConversion(uint8_t *buffer) = 0;
virtual Kind getKind() {return IsFPConversion;}
};
class X86FPConvertToIntSnippet : public TR::X86FPConversionSnippet
{
TR::X86RegInstruction *_convertInstruction;
public:
X86FPConvertToIntSnippet(TR::LabelSymbol *restartlab,
TR::LabelSymbol *snippetlab,
TR::SymbolReference *helperSymRef,
TR::X86RegInstruction *convertInstr,
TR::CodeGenerator *codeGen)
: TR::X86FPConversionSnippet(codeGen, convertInstr->getNode(), restartlab, snippetlab, helperSymRef),
_convertInstruction(convertInstr) {}
TR::X86RegInstruction * getConvertInstruction() {return _convertInstruction;}
uint8_t *genFPConversion(uint8_t *buffer);
virtual uint32_t getLength(int32_t estimatedSnippetStart);
virtual Kind getKind() {return IsFPConvertToInt;}
};
class X86FPConvertToLongSnippet : public TR::X86FPConversionSnippet
{
TR::X86RegMemInstruction *_loadHighInstruction,
*_loadLowInstruction;
TR::RealRegister *_lowRegister,
*_highRegister,
*_doubleRegister;
uint8_t _action;
void analyseLongConversion();
public:
static const uint8_t _registerActions[16];
enum actionFlags
{
kXCHG = 0x01,
kMOVHigh = 0x02,
kMOVLow = 0x04,
kPreserveEDX = 0x08,
kPreserveEAX = 0x10,
kNeedFXCH = 0x80
};
X86FPConvertToLongSnippet(TR::LabelSymbol *restartlab,
TR::LabelSymbol *snippetlab,
TR::SymbolReference *helperSymRef,
TR::Node *node,
TR::X86RegMemInstruction *loadHighInstr,
TR::X86RegMemInstruction *loadLowInstr,
TR::CodeGenerator *codeGen)
: TR::X86FPConversionSnippet(codeGen, node, restartlab, snippetlab, helperSymRef),
_loadHighInstruction(loadHighInstr),
_loadLowInstruction(loadLowInstr),
_lowRegister(0),
_highRegister(0),
_doubleRegister(0),
_action(0) {}
uint8_t getAction() { return _action; }
TR::RealRegister * getLowRegister() { return _lowRegister; }
TR::RealRegister * getHighRegister() { return _highRegister; }
TR::RealRegister * getDoubleRegister() { return _doubleRegister; }
uint8_t *genFPConversion(uint8_t *buffer);
virtual uint32_t getLength(int32_t estimatedSnippetStart);
virtual Kind getKind() {return IsFPConvertToLong;}
};
}
#endif