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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
// 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 <scottb@netwinder.org>
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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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