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125 lines
3.1 KiB
125 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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NetWinder Floating Point Emulator |
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(c) Rebel.COM, 1998,1999 |
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(c) Philip Blundell, 2001 |
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Direct questions, comments to Scott Bambrough <[email protected]> |
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*/ |
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#include "fpa11.h" |
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#include "fpopcode.h" |
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unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); |
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unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); |
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unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); |
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unsigned int EmulateCPDO(const unsigned int opcode) |
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{ |
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FPA11 *fpa11 = GET_FPA11(); |
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FPREG *rFd; |
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unsigned int nType, nDest, nRc; |
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struct roundingData roundData; |
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/* Get the destination size. If not valid let Linux perform |
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an invalid instruction trap. */ |
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nDest = getDestinationSize(opcode); |
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if (typeNone == nDest) |
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return 0; |
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roundData.mode = SetRoundingMode(opcode); |
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roundData.precision = SetRoundingPrecision(opcode); |
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roundData.exception = 0; |
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/* Compare the size of the operands in Fn and Fm. |
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Choose the largest size and perform operations in that size, |
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in order to make use of all the precision of the operands. |
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If Fm is a constant, we just grab a constant of a size |
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matching the size of the operand in Fn. */ |
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if (MONADIC_INSTRUCTION(opcode)) |
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nType = nDest; |
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else |
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nType = fpa11->fType[getFn(opcode)]; |
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if (!CONSTANT_FM(opcode)) { |
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register unsigned int Fm = getFm(opcode); |
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if (nType < fpa11->fType[Fm]) { |
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nType = fpa11->fType[Fm]; |
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} |
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} |
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rFd = &fpa11->fpreg[getFd(opcode)]; |
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switch (nType) { |
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case typeSingle: |
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nRc = SingleCPDO(&roundData, opcode, rFd); |
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break; |
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case typeDouble: |
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nRc = DoubleCPDO(&roundData, opcode, rFd); |
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break; |
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#ifdef CONFIG_FPE_NWFPE_XP |
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case typeExtended: |
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nRc = ExtendedCPDO(&roundData, opcode, rFd); |
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break; |
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#endif |
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default: |
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nRc = 0; |
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} |
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/* The CPDO functions used to always set the destination type |
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to be the same as their working size. */ |
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if (nRc != 0) { |
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/* If the operation succeeded, check to see if the result in the |
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destination register is the correct size. If not force it |
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to be. */ |
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fpa11->fType[getFd(opcode)] = nDest; |
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#ifdef CONFIG_FPE_NWFPE_XP |
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if (nDest != nType) { |
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switch (nDest) { |
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case typeSingle: |
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{ |
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if (typeDouble == nType) |
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rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
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else |
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rFd->fSingle = floatx80_to_float32(&roundData, rFd->fExtended); |
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} |
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break; |
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case typeDouble: |
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{ |
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if (typeSingle == nType) |
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rFd->fDouble = float32_to_float64(rFd->fSingle); |
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else |
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rFd->fDouble = floatx80_to_float64(&roundData, rFd->fExtended); |
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} |
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break; |
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case typeExtended: |
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{ |
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if (typeSingle == nType) |
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rFd->fExtended = float32_to_floatx80(rFd->fSingle); |
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else |
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rFd->fExtended = float64_to_floatx80(rFd->fDouble); |
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} |
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break; |
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} |
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} |
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#else |
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if (nDest != nType) { |
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if (nDest == typeSingle) |
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rFd->fSingle = float64_to_float32(&roundData, rFd->fDouble); |
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else |
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rFd->fDouble = float32_to_float64(rFd->fSingle); |
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} |
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#endif |
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} |
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if (roundData.exception) |
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float_raise(roundData.exception); |
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return nRc; |
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}
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