f148af2593
Patch from Richard Purdie NWFPE used global variables which meant it wasn't safe for use with preemptive kernels. This patch removes them and communicates the information between functions in a preempt safe manner. Generation of some exceptions was broken and this has also been corrected. Tests with glibc's maths test suite show no change in the results before/after this patch. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
155 lines
4 KiB
C
155 lines
4 KiB
C
/*
|
|
NetWinder Floating Point Emulator
|
|
(c) Rebel.COM, 1998,1999
|
|
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "fpa11.h"
|
|
#include "softfloat.h"
|
|
#include "fpopcode.h"
|
|
|
|
floatx80 floatx80_exp(floatx80 Fm);
|
|
floatx80 floatx80_ln(floatx80 Fm);
|
|
floatx80 floatx80_sin(floatx80 rFm);
|
|
floatx80 floatx80_cos(floatx80 rFm);
|
|
floatx80 floatx80_arcsin(floatx80 rFm);
|
|
floatx80 floatx80_arctan(floatx80 rFm);
|
|
floatx80 floatx80_log(floatx80 rFm);
|
|
floatx80 floatx80_tan(floatx80 rFm);
|
|
floatx80 floatx80_arccos(floatx80 rFm);
|
|
floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
|
|
floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);
|
|
|
|
static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
|
|
{
|
|
return floatx80_sub(roundData, rFm, rFn);
|
|
}
|
|
|
|
static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
|
|
{
|
|
return floatx80_div(roundData, rFm, rFn);
|
|
}
|
|
|
|
static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
|
|
[ADF_CODE >> 20] = floatx80_add,
|
|
[MUF_CODE >> 20] = floatx80_mul,
|
|
[SUF_CODE >> 20] = floatx80_sub,
|
|
[RSF_CODE >> 20] = floatx80_rsf,
|
|
[DVF_CODE >> 20] = floatx80_div,
|
|
[RDF_CODE >> 20] = floatx80_rdv,
|
|
[RMF_CODE >> 20] = floatx80_rem,
|
|
|
|
/* strictly, these opcodes should not be implemented */
|
|
[FML_CODE >> 20] = floatx80_mul,
|
|
[FDV_CODE >> 20] = floatx80_div,
|
|
[FRD_CODE >> 20] = floatx80_rdv,
|
|
};
|
|
|
|
static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
|
|
{
|
|
return rFm;
|
|
}
|
|
|
|
static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
|
|
{
|
|
rFm.high ^= 0x8000;
|
|
return rFm;
|
|
}
|
|
|
|
static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
|
|
{
|
|
rFm.high &= 0x7fff;
|
|
return rFm;
|
|
}
|
|
|
|
static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
|
|
[MVF_CODE >> 20] = floatx80_mvf,
|
|
[MNF_CODE >> 20] = floatx80_mnf,
|
|
[ABS_CODE >> 20] = floatx80_abs,
|
|
[RND_CODE >> 20] = floatx80_round_to_int,
|
|
[URD_CODE >> 20] = floatx80_round_to_int,
|
|
[SQT_CODE >> 20] = floatx80_sqrt,
|
|
[NRM_CODE >> 20] = floatx80_mvf,
|
|
};
|
|
|
|
unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
|
|
{
|
|
FPA11 *fpa11 = GET_FPA11();
|
|
floatx80 rFm;
|
|
unsigned int Fm, opc_mask_shift;
|
|
|
|
Fm = getFm(opcode);
|
|
if (CONSTANT_FM(opcode)) {
|
|
rFm = getExtendedConstant(Fm);
|
|
} else {
|
|
switch (fpa11->fType[Fm]) {
|
|
case typeSingle:
|
|
rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
|
|
break;
|
|
|
|
case typeDouble:
|
|
rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
|
|
break;
|
|
|
|
case typeExtended:
|
|
rFm = fpa11->fpreg[Fm].fExtended;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
|
|
if (!MONADIC_INSTRUCTION(opcode)) {
|
|
unsigned int Fn = getFn(opcode);
|
|
floatx80 rFn;
|
|
|
|
switch (fpa11->fType[Fn]) {
|
|
case typeSingle:
|
|
rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
|
|
break;
|
|
|
|
case typeDouble:
|
|
rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
|
|
break;
|
|
|
|
case typeExtended:
|
|
rFn = fpa11->fpreg[Fn].fExtended;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (dyadic_extended[opc_mask_shift]) {
|
|
rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else {
|
|
if (monadic_extended[opc_mask_shift]) {
|
|
rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|