mirror of
https://github.com/autc04/Retro68.git
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240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/* Functions needed for soft-float on powerpc64-linux, copied from
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libgcc2.c with macros expanded to force the use of specific types.
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Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
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2000, 2001, 2002, 2003, 2004, 2006, 2009, 2011
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Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#if defined(__powerpc64__) || defined (__64BIT__) || defined(__ppc64__)
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#define TMODES
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#include "fp-bit.h"
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extern DItype __fixtfdi (TFtype);
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extern DItype __fixdfdi (DFtype);
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extern DItype __fixsfdi (SFtype);
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extern USItype __fixunsdfsi (DFtype);
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extern USItype __fixunssfsi (SFtype);
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extern TFtype __floatditf (DItype);
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extern TFtype __floatunditf (UDItype);
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extern DFtype __floatdidf (DItype);
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extern DFtype __floatundidf (UDItype);
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extern SFtype __floatdisf (DItype);
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extern SFtype __floatundisf (UDItype);
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extern DItype __fixunstfdi (TFtype);
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static DItype local_fixunssfdi (SFtype);
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static DItype local_fixunsdfdi (DFtype);
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DItype
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__fixtfdi (TFtype a)
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{
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if (a < 0)
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return - __fixunstfdi (-a);
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return __fixunstfdi (a);
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}
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DItype
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__fixdfdi (DFtype a)
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{
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if (a < 0)
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return - local_fixunsdfdi (-a);
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return local_fixunsdfdi (a);
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}
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DItype
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__fixsfdi (SFtype a)
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{
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if (a < 0)
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return - local_fixunssfdi (-a);
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return local_fixunssfdi (a);
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}
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USItype
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__fixunsdfsi (DFtype a)
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{
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if (a >= - (DFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
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return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
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- (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
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return (SItype) a;
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}
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USItype
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__fixunssfsi (SFtype a)
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{
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if (a >= - (SFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
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return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
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- (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
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return (SItype) a;
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}
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TFtype
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__floatditf (DItype u)
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{
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DFtype dh, dl;
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dh = (SItype) (u >> (sizeof (SItype) * 8));
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dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return (TFtype) dh + (TFtype) dl;
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}
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TFtype
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__floatunditf (UDItype u)
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{
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DFtype dh, dl;
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dh = (USItype) (u >> (sizeof (SItype) * 8));
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dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return (TFtype) dh + (TFtype) dl;
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}
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DFtype
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__floatdidf (DItype u)
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{
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DFtype d;
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d = (SItype) (u >> (sizeof (SItype) * 8));
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d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return d;
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}
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DFtype
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__floatundidf (UDItype u)
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{
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DFtype d;
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d = (USItype) (u >> (sizeof (SItype) * 8));
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d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return d;
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}
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SFtype
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__floatdisf (DItype u)
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{
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DFtype f;
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if (53 < (sizeof (DItype) * 8)
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&& 53 > ((sizeof (DItype) * 8) - 53 + 24))
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{
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if (! (- ((DItype) 1 << 53) < u
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&& u < ((DItype) 1 << 53)))
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{
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if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
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{
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u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
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u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
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}
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}
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}
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f = (SItype) (u >> (sizeof (SItype) * 8));
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f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return (SFtype) f;
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}
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SFtype
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__floatundisf (UDItype u)
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{
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DFtype f;
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if (53 < (sizeof (DItype) * 8)
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&& 53 > ((sizeof (DItype) * 8) - 53 + 24))
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{
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if (u >= ((UDItype) 1 << 53))
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{
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if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
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{
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u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
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u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
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}
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}
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}
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f = (USItype) (u >> (sizeof (SItype) * 8));
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f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
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f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
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return (SFtype) f;
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}
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DItype
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__fixunstfdi (TFtype a)
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{
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if (a < 0)
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return 0;
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/* Compute high word of result, as a flonum. */
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const TFtype b = (a / (((UDItype) 1) << (sizeof (SItype) * 8)));
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/* Convert that to fixed (but not to DItype!),
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and shift it into the high word. */
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UDItype v = (USItype) b;
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v <<= (sizeof (SItype) * 8);
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/* Remove high part from the TFtype, leaving the low part as flonum. */
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a -= (TFtype) v;
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/* Convert that to fixed (but not to DItype!) and add it in.
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Sometimes A comes out negative. This is significant, since
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A has more bits than a long int does. */
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if (a < 0)
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v -= (USItype) (-a);
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else
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v += (USItype) a;
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return v;
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}
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/* This version is needed to prevent recursion; fixunsdfdi in libgcc
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calls fixdfdi, which in turn calls calls fixunsdfdi. */
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static DItype
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local_fixunsdfdi (DFtype a)
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{
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USItype hi, lo;
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hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
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lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
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return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
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}
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/* This version is needed to prevent recursion; fixunssfdi in libgcc
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calls fixsfdi, which in turn calls calls fixunssfdi. */
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static DItype
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local_fixunssfdi (SFtype original_a)
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{
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DFtype a = original_a;
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USItype hi, lo;
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hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
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lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
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return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
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}
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#endif /* __powerpc64__ */
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