154 lines
4.6 KiB
C++
154 lines
4.6 KiB
C++
/*
|
|
* 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;
|
|
};
|
|
|
|
} // namespace PowerISA
|
|
|
|
#endif //__ARCH_POWER_INSTS_FLOATING_HH__
|