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annotate libgcc/config/s390/32/_fixtfdi.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents
children 04ced10e8804
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rev   line source
55
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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1 /* Definitions of target machine for GNU compiler, for IBM S/390
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2 Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009
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3 Free Software Foundation, Inc.
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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4 Contributed by Hartmut Penner (hpenner@de.ibm.com) and
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5 Ulrich Weigand (uweigand@de.ibm.com).
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6
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7 This file is part of GCC.
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8
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9 GCC is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License as published by the Free
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11 Software Foundation; either version 3, or (at your option) any later
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12 version.
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13
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14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 Under Section 7 of GPL version 3, you are granted additional
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20 permissions described in the GCC Runtime Library Exception, version
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21 3.1, as published by the Free Software Foundation.
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22
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23 You should have received a copy of the GNU General Public License and
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24 a copy of the GCC Runtime Library Exception along with this program;
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25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 <http://www.gnu.org/licenses/>. */
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27
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28 #define EXPD(fp) (((fp.l.i[0]) >> 16) & 0x7FFF)
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29 #define EXPONENT_BIAS 16383
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30 #define MANTISSA_BITS 112
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31 #define PRECISION (MANTISSA_BITS + 1)
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32 #define SIGNBIT 0x80000000
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33 #define SIGND(fp) ((fp.l.i[0]) & SIGNBIT)
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34 #define MANTD_HIGH_LL(fp) ((fp.ll[0] & HIGH_LL_FRAC_MASK) | HIGH_LL_UNIT_BIT)
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35 #define MANTD_LOW_LL(fp) (fp.ll[1])
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36 #define FRACD_ZERO_P(fp) (!fp.ll[1] && !(fp.ll[0] & HIGH_LL_FRAC_MASK))
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37 #define HIGH_LL_FRAC_BITS 48
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38 #define HIGH_LL_UNIT_BIT ((UDItype_x)1 << HIGH_LL_FRAC_BITS)
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39 #define HIGH_LL_FRAC_MASK (HIGH_LL_UNIT_BIT - 1)
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40
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41 typedef int DItype_x __attribute__ ((mode (DI)));
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42 typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
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43 typedef int SItype_x __attribute__ ((mode (SI)));
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44 typedef unsigned int USItype_x __attribute__ ((mode (SI)));
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45
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46 union double_long {
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47 long double d;
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48 struct {
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49 SItype_x i[4]; /* 32 bit parts: 0 upper ... 3 lowest */
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50 } l;
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51 UDItype_x ll[2]; /* 64 bit parts: 0 upper, 1 lower */
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52 };
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53
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54 DItype_x __fixtfdi (long double a1);
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55
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56 /* convert double to unsigned int */
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57 DItype_x
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58 __fixtfdi (long double a1)
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59 {
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60 register union double_long dl1;
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61 register int exp;
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62 register UDItype_x l;
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63
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64 dl1.d = a1;
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65
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66 /* +/- 0, denormalized */
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67 if (!EXPD (dl1))
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68 return 0;
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69
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70 /* The exponent - considered the binary point at the right end of
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71 the mantissa. */
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72 exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS;
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73
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74 /* number < 1: If the mantissa would need to be right-shifted more bits than
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75 its size the result would be zero. */
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76 if (exp <= -PRECISION)
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77 return 0;
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78
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79 /* NaN: All exponent bits set and a nonzero fraction. */
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80 if ((EXPD(dl1) == 0x7fff) && !FRACD_ZERO_P (dl1))
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81 return 0x8000000000000000ULL;
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82
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83 /* One extra bit is needed for the unit bit which is appended by
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84 MANTD_HIGH_LL on the left of the matissa. */
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85 exp += HIGH_LL_FRAC_BITS + 1;
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86
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87 /* If the result would still need a left shift it will be too large
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88 to be represented. Compared to the unsigned variant we have to
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89 take care that there is still space for the sign bit to be
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90 applied. So we can only go on if there is a right-shift by one
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91 or more. */
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92 if (exp >= 0)
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93 {
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94 l = 1ULL << 63; /* long long min */
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95 return SIGND (dl1) ? l : l - 1;
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96 }
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97
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98 l = MANTD_LOW_LL (dl1) >> (HIGH_LL_FRAC_BITS + 1)
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99 | MANTD_HIGH_LL (dl1) << (64 - (HIGH_LL_FRAC_BITS + 1));
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100
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101 return SIGND (dl1) ? -(l >> -exp) : l >> -exp;
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102 }