1 | /* |
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2 | (C) Copyright IBM Corp. 2009 |
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3 | |
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4 | All rights reserved. |
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5 | |
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6 | Redistribution and use in source and binary forms, with or without |
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7 | modification, are permitted provided that the following conditions are met: |
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8 | |
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9 | * Redistributions of source code must retain the above copyright notice, |
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10 | this list of conditions and the following disclaimer. |
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11 | * Redistributions in binary form must reproduce the above copyright |
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12 | notice, this list of conditions and the following disclaimer in the |
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13 | documentation and/or other materials provided with the distribution. |
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14 | * Neither the name of IBM nor the names of its contributors may be |
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15 | used to endorse or promote products derived from this software without |
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16 | specific prior written permission. |
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17 | |
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18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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28 | POSSIBILITY OF SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | #include <stdlib.h> |
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32 | #include "local.h" |
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33 | #include "mprec.h" |
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34 | #undef FLT_ROUNDS |
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35 | |
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36 | #ifdef _HAVE_LONG_DOUBLE |
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37 | |
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38 | /* Intel MCU has no x87 floating point unit */ |
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39 | #if (defined (__x86_64__) || defined (__i386__)) && !defined (__iamcu__) |
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40 | static const int map[] = { |
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41 | 1, /* round to nearest */ |
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42 | 3, /* round to zero */ |
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43 | 2, /* round to negative infinity */ |
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44 | 0 /* round to positive infinity */ |
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45 | }; |
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46 | |
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47 | int |
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48 | __flt_rounds(void) |
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49 | { |
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50 | int x; |
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51 | |
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52 | /* Assume that the x87 and the SSE unit agree on the rounding mode. */ |
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53 | __asm("fnstcw %0" : "=m" (x)); |
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54 | return (map[(x >> 10) & 0x03]); |
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55 | } |
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56 | #define FLT_ROUNDS __flt_rounds() |
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57 | #else |
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58 | #define FLT_ROUNDS 0 |
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59 | #endif |
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60 | |
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61 | long double |
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62 | _strtold_r (struct _reent *ptr, const char *__restrict s00, |
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63 | char **__restrict se) |
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64 | { |
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65 | #ifdef _LDBL_EQ_DBL |
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66 | /* On platforms where long double is as wide as double. */ |
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67 | return _strtod_l (ptr, s00, se, __get_current_locale ()); |
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68 | #else |
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69 | long double result; |
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70 | |
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71 | _strtorx_l (ptr, s00, se, FLT_ROUNDS, &result, __get_current_locale ()); |
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72 | return result; |
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73 | #endif |
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74 | } |
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75 | |
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76 | long double |
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77 | strtold_l (const char *__restrict s00, char **__restrict se, locale_t loc) |
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78 | { |
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79 | #ifdef _LDBL_EQ_DBL |
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80 | /* On platforms where long double is as wide as double. */ |
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81 | return _strtod_l (_REENT, s00, se, loc); |
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82 | #else |
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83 | long double result; |
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84 | |
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85 | _strtorx_l (_REENT, s00, se, FLT_ROUNDS, &result, loc); |
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86 | return result; |
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87 | #endif |
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88 | } |
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89 | |
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90 | long double |
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91 | strtold (const char *__restrict s00, char **__restrict se) |
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92 | { |
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93 | #ifdef _LDBL_EQ_DBL |
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94 | /* On platforms where long double is as wide as double. */ |
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95 | return _strtod_l (_REENT, s00, se, __get_current_locale ()); |
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96 | #else |
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97 | long double result; |
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98 | |
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99 | _strtorx_l (_REENT, s00, se, FLT_ROUNDS, &result, __get_current_locale ()); |
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100 | return result; |
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101 | #endif |
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102 | } |
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103 | |
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104 | #endif /* _HAVE_LONG_DOUBLE */ |
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105 | |
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