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/*
* Copyright (c) 2003-2006 The Regents of The University of Michigan
* Copyright (c) 2007-2008 The Florida State University
* 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: Korey Sewell
* Stephen Hines
*/
#include "arch/arm/regfile.hh"
#include "arch/arm/utility.hh"
#include "base/misc.hh"
#include "base/bitfield.hh"
using namespace ArmISA;
uint64_t
ArmISA::fpConvert(ConvertType cvt_type, double fp_val)
{
switch (cvt_type)
{
case SINGLE_TO_DOUBLE:
{
double sdouble_val = fp_val;
void *sdouble_ptr = &sdouble_val;
uint64_t sdp_bits = *(uint64_t *) sdouble_ptr;
return sdp_bits;
}
case SINGLE_TO_WORD:
{
int32_t sword_val = (int32_t) fp_val;
void *sword_ptr = &sword_val;
uint64_t sword_bits= *(uint32_t *) sword_ptr;
return sword_bits;
}
case WORD_TO_SINGLE:
{
float wfloat_val = fp_val;
void *wfloat_ptr = &wfloat_val;
uint64_t wfloat_bits = *(uint32_t *) wfloat_ptr;
return wfloat_bits;
}
case WORD_TO_DOUBLE:
{
double wdouble_val = fp_val;
void *wdouble_ptr = &wdouble_val;
uint64_t wdp_bits = *(uint64_t *) wdouble_ptr;
return wdp_bits;
}
default:
panic("Invalid Floating Point Conversion Type (%d). See \"types.hh\" for List of Conversions\n",cvt_type);
return 0;
}
}
double
ArmISA::roundFP(double val, int digits)
{
double digit_offset = pow(10.0,digits);
val = val * digit_offset;
val = val + 0.5;
val = floor(val);
val = val / digit_offset;
return val;
}
double
ArmISA::truncFP(double val)
{
int trunc_val = (int) val;
return (double) trunc_val;
}
bool
ArmISA::getCondCode(uint32_t fcsr, int cc_idx)
{
int shift = (cc_idx == 0) ? 23 : cc_idx + 24;
bool cc_val = (fcsr >> shift) & 0x00000001;
return cc_val;
}
uint32_t
ArmISA::genCCVector(uint32_t fcsr, int cc_num, uint32_t cc_val)
{
int cc_idx = (cc_num == 0) ? 23 : cc_num + 24;
fcsr = bits(fcsr, 31, cc_idx + 1) << (cc_idx + 1) |
cc_val << cc_idx |
bits(fcsr, cc_idx - 1, 0);
return fcsr;
}
uint32_t
ArmISA::genInvalidVector(uint32_t fcsr_bits)
{
//Set FCSR invalid in "flag" field
int invalid_offset = Invalid + Flag_Field;
fcsr_bits = fcsr_bits | (1 << invalid_offset);
//Set FCSR invalid in "cause" flag
int cause_offset = Invalid + Cause_Field;
fcsr_bits = fcsr_bits | (1 << cause_offset);
return fcsr_bits;
}
bool
ArmISA::isNan(void *val_ptr, int size)
{
switch (size)
{
case 32:
{
uint32_t val_bits = *(uint32_t *) val_ptr;
return (bits(val_bits, 30, 23) == 0xFF);
}
case 64:
{
uint64_t val_bits = *(uint64_t *) val_ptr;
return (bits(val_bits, 62, 52) == 0x7FF);
}
default:
panic("Type unsupported. Size mismatch\n");
}
}
bool
ArmISA::isQnan(void *val_ptr, int size)
{
switch (size)
{
case 32:
{
uint32_t val_bits = *(uint32_t *) val_ptr;
return (bits(val_bits, 30, 22) == 0x1FE);
}
case 64:
{
uint64_t val_bits = *(uint64_t *) val_ptr;
return (bits(val_bits, 62, 51) == 0xFFE);
}
default:
panic("Type unsupported. Size mismatch\n");
}
}
bool
ArmISA::isSnan(void *val_ptr, int size)
{
switch (size)
{
case 32:
{
uint32_t val_bits = *(uint32_t *) val_ptr;
return (bits(val_bits, 30, 22) == 0x1FF);
}
case 64:
{
uint64_t val_bits = *(uint64_t *) val_ptr;
return (bits(val_bits, 62, 51) == 0xFFF);
}
default:
panic("Type unsupported. Size mismatch\n");
}
}
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