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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#ifndef _JIT_FP
#define _JIT_FP
// Auxiliary structures.
#if FEATURE_STACK_FP_X87
enum dummyFPenum
{
#define REGDEF(name, rnum, mask, sname) dummmy_##name = rnum,
#include "registerfp.h"
FP_VIRTUALREGISTERS,
};
// FlatFPStateX87 holds the state of the virtual register file. For each
// virtual register we keep track to which physical register we're
// mapping. We also keep track of the physical stack.
#define FP_PHYSICREGISTERS FP_VIRTUALREGISTERS
#define FP_VRNOTMAPPED -1
struct FlatFPStateX87
{
public:
void Init(FlatFPStateX87* pFrom = 0);
bool Mapped(unsigned uEntry); // Is virtual register mapped
void Unmap(unsigned uEntry); // Unmaps a virtual register
void Associate(unsigned uEntry, unsigned uStack);
unsigned StackToST(unsigned uEntry); // Maps the stack to a ST(x) entry
unsigned VirtualToST(unsigned uEntry);
unsigned STToVirtual(unsigned uST);
unsigned TopIndex();
unsigned TopVirtual();
void Rename(unsigned uVirtualTo, unsigned uVirtualFrom);
unsigned Pop();
void Push(unsigned uEntry);
bool IsEmpty();
// Debug/test methods
static bool AreEqual(FlatFPStateX87* pSrc, FlatFPStateX87* pDst);
#ifdef DEBUG
bool IsValidEntry(unsigned uEntry);
bool IsConsistent();
void UpdateMappingFromStack();
void Dump();
// In some optimizations the stack will be inconsistent in some transactions. We want to keep
// the checks for everthing else, so if have the stack in an inconsistent state, you must
// ignore it on purpose.
bool m_bIgnoreConsistencyChecks;
inline void IgnoreConsistencyChecks(bool bIgnore)
{
m_bIgnoreConsistencyChecks = bIgnore;
}
#else
inline void IgnoreConsistencyChecks(bool bIgnore)
{
}
#endif
unsigned m_uVirtualMap[FP_VIRTUALREGISTERS];
unsigned m_uStack[FP_PHYSICREGISTERS];
unsigned m_uStackSize;
};
#endif // FEATURE_STACK_FP_X87
#endif
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