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/*
* Copyright (c) 2009 The University of Edinburgh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Timothy M. Jones
* Korey Sewell
*/
#ifndef __ARCH_POWER_INSTS_FLOATING_HH__
#define __ARCH_POWER_INSTS_FLOATING_HH__
#include "arch/power/insts/static_inst.hh"
#include "base/bitfield.hh"
#include "base/cprintf.hh"
namespace PowerISA
{
/**
* Base class for floating point operations.
*/
class FloatOp : public PowerStaticInst
{
protected:
bool rcSet;
/// Constructor
FloatOp(const char *mnem, MachInst _machInst, OpClass __opClass)
: PowerStaticInst(mnem, _machInst, __opClass)
{
}
// Test for NaN (maximum biased exponent & non-zero fraction)
inline bool
isNan(uint32_t val_bits) const
{
return ((bits(val_bits, 30, 23) == 0xFF) && bits(val_bits, 22, 0));
}
inline bool
isNan(uint64_t val_bits) const
{
return ((bits(val_bits, 62, 52) == 0x7FF) && bits(val_bits, 51, 0));
}
inline bool
isNan(float val) const
{
void *val_ptr = &val;
uint32_t val_bits = *(uint32_t *) val_ptr;
return isNan(val_bits);
}
inline bool
isNan(double val) const
{
void *val_ptr = &val;
uint64_t val_bits = *(uint64_t *) val_ptr;
return isNan(val_bits);
}
// Test for SNaN (NaN with high order bit of fraction set to 0)
inline bool
isSnan(uint32_t val_bits) const
{
return ((bits(val_bits, 30, 22) == 0x1FE) && bits(val_bits, 22, 0));
}
// Test for QNaN (NaN with high order bit of fraction set to 1)
inline bool
isQnan(uint32_t val_bits) const
{
return (bits(val_bits, 30, 22) == 0x1FF);
}
// Test for infinity (maximum biased exponent and zero fraction)
inline bool
isInfinity(uint32_t val_bits) const
{
return ((bits(val_bits, 30, 23) == 0xFF) && !bits(val_bits, 22, 0));
}
// Test for normalized numbers (biased exponent in the range 1 to 254)
inline bool
isNormalized(uint32_t val_bits) const
{
return ((bits(val_bits, 30, 23) != 0xFF) && bits(val_bits, 22, 0));
}
// Test for denormalized numbers (biased exponent of zero and
// non-zero fraction)
inline bool
isDenormalized(uint32_t val_bits) const
{
return (!bits(val_bits, 30, 23) && bits(val_bits, 22, 0));
}
// Test for zero (biased exponent of zero and fraction of zero)
inline bool
isZero(uint32_t val_bits) const
{
return (!bits(val_bits, 30, 23) && !bits(val_bits, 22, 0));
}
// Test for negative
inline bool
isNegative(uint32_t val_bits) const
{
return (bits(val_bits, 31));
}
// Compute the CR field
inline uint32_t
makeCRField(double a, double b) const
{
uint32_t c = 0;
if (isNan(a) || isNan(b)) { c = 0x1; }
else if (a < b) { c = 0x8; }
else if (a > b) { c = 0x4; }
else { c = 0x2; }
return c;
}
std::string generateDisassembly(
Addr pc, const SymbolTable *symtab) const override;
};
} // namespace PowerISA
#endif //__ARCH_POWER_INSTS_FLOATING_HH__
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