URL
https://opencores.org/ocsvn/or1k_soc_on_altera_embedded_dev_kit/or1k_soc_on_altera_embedded_dev_kit/trunk
Subversion Repositories or1k_soc_on_altera_embedded_dev_kit
[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [arm/] [nwfpe/] [fpa11_cpdo.c] - Rev 3
Compare with Previous | Blame | View Log
/* NetWinder Floating Point Emulator (c) Rebel.COM, 1998,1999 (c) Philip Blundell, 2001 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 "fpopcode.h" unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); unsigned int EmulateCPDO(const unsigned int opcode) { FPA11 *fpa11 = GET_FPA11(); FPREG *rFd; unsigned int nType, nDest, nRc; struct roundingData roundData; /* Get the destination size. If not valid let Linux perform an invalid instruction trap. */ nDest = getDestinationSize(opcode); if (typeNone == nDest) return 0; roundData.mode = SetRoundingMode(opcode); roundData.precision = SetRoundingPrecision(opcode); roundData.exception = 0; /* Compare the size of the operands in Fn and Fm. Choose the largest size and perform operations in that size, in order to make use of all the precision of the operands. If Fm is a constant, we just grab a constant of a size matching the size of the operand in Fn. */ if (MONADIC_INSTRUCTION(opcode)) nType = nDest; else nType = fpa11->fType[getFn(opcode)]; if (!CONSTANT_FM(opcode)) { register unsigned int Fm = getFm(opcode); if (nType < fpa11->fType[Fm]) { nType = fpa11->fType[Fm]; } } rFd = &fpa11->fpreg[getFd(opcode)]; switch (nType) { case typeSingle: nRc = SingleCPDO(&roundData, opcode, rFd); break; case typeDouble: nRc = DoubleCPDO(&roundData, opcode, rFd); break; #ifdef CONFIG_FPE_NWFPE_XP case typeExtended: nRc = ExtendedCPDO(&roundData, opcode, rFd); break; #endif default: nRc = 0; } /* The CPDO functions used to always set the destination type to be the same as their working size. */ if (nRc != 0) { /* If the operation succeeded, check to see if the result in the destination register is the correct size. If not force it to be. */ fpa11->fType[getFd(opcode)] = nDest; #ifdef CONFIG_FPE_NWFPE_XP if (nDest != nType) { switch (nDest) { case typeSingle: { if (typeDouble == nType) rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); else rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended); } break; case typeDouble: { if (typeSingle == nType) rFd->fDouble = float32_to_float64(rFd->fSingle); else rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended); } break; case typeExtended: { if (typeSingle == nType) rFd->fExtended = float32_to_floatx80(rFd->fSingle); else rFd->fExtended = float64_to_floatx80(rFd->fDouble); } break; } } #else if (nDest != nType) { if (nDest == typeSingle) rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); else rFd->fDouble = float32_to_float64(rFd->fSingle); } #endif } if (roundData.exception) float_raise(roundData.exception); return nRc; }