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0
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1 /* This is a software decimal floating point library.
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2 Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This implements IEEE 754 decimal floating point arithmetic, but
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26 does not provide a mechanism for setting the rounding mode, or for
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27 generating or handling exceptions. Conversions between decimal
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28 floating point types and other types depend on C library functions.
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29
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30 Contributed by Ben Elliston <bje@au.ibm.com>. */
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31
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32 #include <stdio.h>
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33 #include <stdlib.h>
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34 /* FIXME: compile with -std=gnu99 to get these from stdlib.h */
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35 extern float strtof (const char *, char **);
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36 extern long double strtold (const char *, char **);
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37 #include <string.h>
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38 #include <limits.h>
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39
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40 #include "config/dfp-bit.h"
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41
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42 /* Forward declarations. */
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43 #if WIDTH == 32 || WIDTH_TO == 32
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44 void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
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45 void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);
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46 #endif
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47 #if WIDTH == 64 || WIDTH_TO == 64
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48 void __host_to_ieee_64 (_Decimal64 in, decimal64 *out);
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49 void __ieee_to_host_64 (decimal64 in, _Decimal64 *out);
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50 #endif
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51 #if WIDTH == 128 || WIDTH_TO == 128
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52 void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
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53 void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
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54 #endif
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55
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56 /* A pointer to a binary decFloat operation. */
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57 typedef decFloat* (*dfp_binary_func)
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58 (decFloat *, const decFloat *, const decFloat *, decContext *);
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59
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60 /* Binary operations. */
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61
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62 /* Use a decFloat (decDouble or decQuad) function to perform a DFP
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63 binary operation. */
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64 static inline decFloat
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65 dfp_binary_op (dfp_binary_func op, decFloat arg_a, decFloat arg_b)
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66 {
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67 decFloat result;
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68 decContext context;
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69
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70 decContextDefault (&context, CONTEXT_INIT);
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71 DFP_INIT_ROUNDMODE (context.round);
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72
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73 /* Perform the operation. */
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74 op (&result, &arg_a, &arg_b, &context);
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75
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76 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
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77 {
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78 /* decNumber exception flags we care about here. */
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79 int ieee_flags;
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80 int dec_flags = DEC_IEEE_854_Division_by_zero | DEC_IEEE_854_Inexact
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81 | DEC_IEEE_854_Invalid_operation | DEC_IEEE_854_Overflow
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82 | DEC_IEEE_854_Underflow;
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83 dec_flags &= context.status;
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84 ieee_flags = DFP_IEEE_FLAGS (dec_flags);
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85 if (ieee_flags != 0)
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86 DFP_HANDLE_EXCEPTIONS (ieee_flags);
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87 }
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88
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89 return result;
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90 }
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91
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92 #if WIDTH == 32
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93 /* The decNumber package doesn't provide arithmetic for decSingle (32 bits);
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94 convert to decDouble, use the operation for that, and convert back. */
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95 static inline _Decimal32
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96 d32_binary_op (dfp_binary_func op, _Decimal32 arg_a, _Decimal32 arg_b)
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97 {
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98 union { _Decimal32 c; decSingle f; } a32, b32, res32;
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99 decDouble a, b, res;
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100 decContext context;
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101
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102 /* Widen the operands and perform the operation. */
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103 a32.c = arg_a;
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104 b32.c = arg_b;
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105 decSingleToWider (&a32.f, &a);
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106 decSingleToWider (&b32.f, &b);
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107 res = dfp_binary_op (op, a, b);
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108
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109 /* Narrow the result, which might result in an underflow or overflow. */
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110 decContextDefault (&context, CONTEXT_INIT);
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111 DFP_INIT_ROUNDMODE (context.round);
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112 decSingleFromWider (&res32.f, &res, &context);
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113 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
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114 {
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115 /* decNumber exception flags we care about here. */
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116 int ieee_flags;
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117 int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Overflow
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118 | DEC_IEEE_854_Underflow;
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119 dec_flags &= context.status;
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120 ieee_flags = DFP_IEEE_FLAGS (dec_flags);
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121 if (ieee_flags != 0)
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122 DFP_HANDLE_EXCEPTIONS (ieee_flags);
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123 }
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124
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125 return res32.c;
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126 }
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127 #else
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128 /* decFloat operations are supported for decDouble (64 bits) and
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129 decQuad (128 bits). The bit patterns for the types are the same. */
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130 static inline DFP_C_TYPE
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131 dnn_binary_op (dfp_binary_func op, DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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132 {
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133 union { DFP_C_TYPE c; decFloat f; } a, b, result;
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134
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135 a.c = arg_a;
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136 b.c = arg_b;
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137 result.f = dfp_binary_op (op, a.f, b.f);
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138 return result.c;
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139 }
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140 #endif
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141
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142 /* Comparison operations. */
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143
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144 /* Use a decFloat (decDouble or decQuad) function to perform a DFP
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145 comparison. */
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146 static inline CMPtype
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147 dfp_compare_op (dfp_binary_func op, decFloat arg_a, decFloat arg_b)
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148 {
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149 decContext context;
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150 decFloat res;
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151 int result;
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152
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153 decContextDefault (&context, CONTEXT_INIT);
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154 DFP_INIT_ROUNDMODE (context.round);
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155
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156 /* Perform the comparison. */
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157 op (&res, &arg_a, &arg_b, &context);
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158
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159 if (DEC_FLOAT_IS_SIGNED (&res))
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160 result = -1;
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161 else if (DEC_FLOAT_IS_ZERO (&res))
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162 result = 0;
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163 else if (DEC_FLOAT_IS_NAN (&res))
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164 result = -2;
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165 else
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166 result = 1;
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167
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168 return (CMPtype) result;
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169 }
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170
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171 #if WIDTH == 32
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172 /* The decNumber package doesn't provide comparisons for decSingle (32 bits);
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173 convert to decDouble, use the operation for that, and convert back. */
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174 static inline CMPtype
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175 d32_compare_op (dfp_binary_func op, _Decimal32 arg_a, _Decimal32 arg_b)
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176 {
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177 union { _Decimal32 c; decSingle f; } a32, b32;
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178 decDouble a, b;
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179
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180 a32.c = arg_a;
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181 b32.c = arg_b;
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182 decSingleToWider (&a32.f, &a);
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183 decSingleToWider (&b32.f, &b);
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184 return dfp_compare_op (op, a, b);
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185 }
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186 #else
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187 /* decFloat comparisons are supported for decDouble (64 bits) and
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188 decQuad (128 bits). The bit patterns for the types are the same. */
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189 static inline CMPtype
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190 dnn_compare_op (dfp_binary_func op, DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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191 {
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192 union { DFP_C_TYPE c; decFloat f; } a, b;
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193
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194 a.c = arg_a;
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195 b.c = arg_b;
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196 return dfp_compare_op (op, a.f, b.f);
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197 }
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198 #endif
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199
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200 #if defined(L_conv_sd)
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201 void
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202 __host_to_ieee_32 (_Decimal32 in, decimal32 *out)
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203 {
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204 memcpy (out, &in, 4);
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205 }
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206
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207 void
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208 __ieee_to_host_32 (decimal32 in, _Decimal32 *out)
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209 {
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210 memcpy (out, &in, 4);
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211 }
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212 #endif /* L_conv_sd */
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213
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214 #if defined(L_conv_dd)
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215 void
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216 __host_to_ieee_64 (_Decimal64 in, decimal64 *out)
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217 {
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218 memcpy (out, &in, 8);
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219 }
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220
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221 void
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222 __ieee_to_host_64 (decimal64 in, _Decimal64 *out)
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223 {
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224 memcpy (out, &in, 8);
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225 }
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226 #endif /* L_conv_dd */
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227
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228 #if defined(L_conv_td)
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229 void
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230 __host_to_ieee_128 (_Decimal128 in, decimal128 *out)
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231 {
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232 memcpy (out, &in, 16);
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233 }
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234
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235 void
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236 __ieee_to_host_128 (decimal128 in, _Decimal128 *out)
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237 {
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238 memcpy (out, &in, 16);
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239 }
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240 #endif /* L_conv_td */
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241
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242 #if defined(L_addsub_sd) || defined(L_addsub_dd) || defined(L_addsub_td)
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243 DFP_C_TYPE
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244 DFP_ADD (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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245 {
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246 return DFP_BINARY_OP (DEC_FLOAT_ADD, arg_a, arg_b);
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247 }
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248
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249 DFP_C_TYPE
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250 DFP_SUB (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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251 {
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252 return DFP_BINARY_OP (DEC_FLOAT_SUBTRACT, arg_a, arg_b);
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253 }
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254 #endif /* L_addsub */
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255
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256 #if defined(L_mul_sd) || defined(L_mul_dd) || defined(L_mul_td)
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257 DFP_C_TYPE
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258 DFP_MULTIPLY (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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259 {
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260 return DFP_BINARY_OP (DEC_FLOAT_MULTIPLY, arg_a, arg_b);
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261 }
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262 #endif /* L_mul */
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263
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264 #if defined(L_div_sd) || defined(L_div_dd) || defined(L_div_td)
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265 DFP_C_TYPE
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266 DFP_DIVIDE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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267 {
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268 return DFP_BINARY_OP (DEC_FLOAT_DIVIDE, arg_a, arg_b);
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269 }
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270 #endif /* L_div */
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271
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272 #if defined (L_eq_sd) || defined (L_eq_dd) || defined (L_eq_td)
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273 CMPtype
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274 DFP_EQ (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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275 {
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276 CMPtype stat;
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277 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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278 /* For EQ return zero for true, nonzero for false. */
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279 return stat != 0;
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280 }
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281 #endif /* L_eq */
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282
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283 #if defined (L_ne_sd) || defined (L_ne_dd) || defined (L_ne_td)
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284 CMPtype
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285 DFP_NE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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286 {
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287 int stat;
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288 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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289 /* For NE return zero for true, nonzero for false. */
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290 if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */
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291 return 1;
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292 return stat != 0;
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293 }
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294 #endif /* L_ne */
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295
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296 #if defined (L_lt_sd) || defined (L_lt_dd) || defined (L_lt_td)
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297 CMPtype
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298 DFP_LT (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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299 {
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300 int stat;
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301 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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302 /* For LT return -1 (<0) for true, 1 for false. */
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303 return (stat == -1) ? -1 : 1;
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304 }
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305 #endif /* L_lt */
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306
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307 #if defined (L_gt_sd) || defined (L_gt_dd) || defined (L_gt_td)
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308 CMPtype
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309 DFP_GT (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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310 {
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311 int stat;
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312 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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313 /* For GT return 1 (>0) for true, -1 for false. */
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314 return (stat == 1) ? 1 : -1;
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315 }
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316 #endif
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317
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318 #if defined (L_le_sd) || defined (L_le_dd) || defined (L_le_td)
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319 CMPtype
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320 DFP_LE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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321 {
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322 int stat;
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323 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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324 /* For LE return 0 (<= 0) for true, 1 for false. */
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325 if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */
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326 return 1;
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327 return stat == 1;
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328 }
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329 #endif /* L_le */
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330
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331 #if defined (L_ge_sd) || defined (L_ge_dd) || defined (L_ge_td)
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332 CMPtype
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333 DFP_GE (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
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334 {
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335 int stat;
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336 stat = DFP_COMPARE_OP (DEC_FLOAT_COMPARE, arg_a, arg_b);
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337 /* For GE return 1 (>=0) for true, -1 for false. */
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338 if (__builtin_expect (stat == -2, 0)) /* An operand is NaN. */
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339 return -1;
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340 return (stat != -1) ? 1 : -1;
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341 }
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342 #endif /* L_ge */
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343
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344 #define BUFMAX 128
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345
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346 /* Check for floating point exceptions that are relevant for conversions
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347 between decimal float values and handle them. */
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348 static inline void
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349 dfp_conversion_exceptions (const int status)
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350 {
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351 /* decNumber exception flags we care about here. */
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352 int ieee_flags;
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353 int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Invalid_operation
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354 | DEC_IEEE_854_Overflow;
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355 dec_flags &= status;
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356 ieee_flags = DFP_IEEE_FLAGS (dec_flags);
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357 if (ieee_flags != 0)
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358 DFP_HANDLE_EXCEPTIONS (ieee_flags);
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359 }
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360
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361 #if defined (L_sd_to_dd)
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362 /* Use decNumber to convert directly from _Decimal32 to _Decimal64. */
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363 _Decimal64
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364 DFP_TO_DFP (_Decimal32 f_from)
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365 {
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366 union { _Decimal32 c; decSingle f; } from;
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367 union { _Decimal64 c; decDouble f; } to;
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368
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369 from.c = f_from;
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370 to.f = *decSingleToWider (&from.f, &to.f);
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371 return to.c;
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372 }
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373 #endif
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374
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375 #if defined (L_sd_to_td)
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376 /* Use decNumber to convert directly from _Decimal32 to _Decimal128. */
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377 _Decimal128
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378 DFP_TO_DFP (_Decimal32 f_from)
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379 {
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380 union { _Decimal32 c; decSingle f; } from;
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381 union { _Decimal128 c; decQuad f; } to;
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382 decDouble temp;
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383
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384 from.c = f_from;
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385 temp = *decSingleToWider (&from.f, &temp);
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386 to.f = *decDoubleToWider (&temp, &to.f);
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|
|
387 return to.c;
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|
|
388 }
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389 #endif
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390
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|
|
391 #if defined (L_dd_to_td)
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392 /* Use decNumber to convert directly from _Decimal64 to _Decimal128. */
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393 _Decimal128
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394 DFP_TO_DFP (_Decimal64 f_from)
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395 {
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396 union { _Decimal64 c; decDouble f; } from;
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397 union { _Decimal128 c; decQuad f; } to;
|
|
|
398
|
|
|
399 from.c = f_from;
|
|
|
400 to.f = *decDoubleToWider (&from.f, &to.f);
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|
|
401 return to.c;
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|
|
402 }
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|
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403 #endif
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|
404
|
|
|
405 #if defined (L_dd_to_sd)
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|
406 /* Use decNumber to convert directly from _Decimal64 to _Decimal32. */
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|
|
407 _Decimal32
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|
|
408 DFP_TO_DFP (_Decimal64 f_from)
|
|
|
409 {
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|
|
410 union { _Decimal32 c; decSingle f; } to;
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|
411 union { _Decimal64 c; decDouble f; } from;
|
|
|
412 decContext context;
|
|
|
413
|
|
|
414 decContextDefault (&context, CONTEXT_INIT);
|
|
|
415 DFP_INIT_ROUNDMODE (context.round);
|
|
|
416 from.c = f_from;
|
|
|
417 to.f = *decSingleFromWider (&to.f, &from.f, &context);
|
|
|
418 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
419 dfp_conversion_exceptions (context.status);
|
|
|
420 return to.c;
|
|
|
421 }
|
|
|
422 #endif
|
|
|
423
|
|
|
424 #if defined (L_td_to_sd)
|
|
|
425 /* Use decNumber to convert directly from _Decimal128 to _Decimal32. */
|
|
|
426 _Decimal32
|
|
|
427 DFP_TO_DFP (_Decimal128 f_from)
|
|
|
428 {
|
|
|
429 union { _Decimal32 c; decSingle f; } to;
|
|
|
430 union { _Decimal128 c; decQuad f; } from;
|
|
|
431 decDouble temp;
|
|
|
432 decContext context;
|
|
|
433
|
|
|
434 decContextDefault (&context, CONTEXT_INIT);
|
|
|
435 DFP_INIT_ROUNDMODE (context.round);
|
|
|
436 from.c = f_from;
|
|
|
437 temp = *decDoubleFromWider (&temp, &from.f, &context);
|
|
|
438 to.f = *decSingleFromWider (&to.f, &temp, &context);
|
|
|
439 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
440 dfp_conversion_exceptions (context.status);
|
|
|
441 return to.c;
|
|
|
442 }
|
|
|
443 #endif
|
|
|
444
|
|
|
445 #if defined (L_td_to_dd)
|
|
|
446 /* Use decNumber to convert directly from _Decimal128 to _Decimal64. */
|
|
|
447 _Decimal64
|
|
|
448 DFP_TO_DFP (_Decimal128 f_from)
|
|
|
449 {
|
|
|
450 union { _Decimal64 c; decDouble f; } to;
|
|
|
451 union { _Decimal128 c; decQuad f; } from;
|
|
|
452 decContext context;
|
|
|
453
|
|
|
454 decContextDefault (&context, CONTEXT_INIT);
|
|
|
455 DFP_INIT_ROUNDMODE (context.round);
|
|
|
456 from.c = f_from;
|
|
|
457 to.f = *decDoubleFromWider (&to.f, &from.f, &context);
|
|
|
458 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
459 dfp_conversion_exceptions (context.status);
|
|
|
460 return to.c;
|
|
|
461 }
|
|
|
462 #endif
|
|
|
463
|
|
|
464 #if defined (L_dd_to_si) || defined (L_td_to_si) \
|
|
|
465 || defined (L_dd_to_usi) || defined (L_td_to_usi)
|
|
|
466 /* Use decNumber to convert directly from decimal float to integer types. */
|
|
|
467 INT_TYPE
|
|
|
468 DFP_TO_INT (DFP_C_TYPE x)
|
|
|
469 {
|
|
|
470 union { DFP_C_TYPE c; decFloat f; } u;
|
|
|
471 decContext context;
|
|
|
472 INT_TYPE i;
|
|
|
473
|
|
|
474 decContextDefault (&context, DEC_INIT_DECIMAL128);
|
|
|
475 context.round = DEC_ROUND_DOWN;
|
|
|
476 u.c = x;
|
|
|
477 i = DEC_FLOAT_TO_INT (&u.f, &context, context.round);
|
|
|
478 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
479 dfp_conversion_exceptions (context.status);
|
|
|
480 return i;
|
|
|
481 }
|
|
|
482 #endif
|
|
|
483
|
|
|
484 #if defined (L_sd_to_si) || (L_sd_to_usi)
|
|
|
485 /* Use decNumber to convert directly from decimal float to integer types. */
|
|
|
486 INT_TYPE
|
|
|
487 DFP_TO_INT (_Decimal32 x)
|
|
|
488 {
|
|
|
489 union { _Decimal32 c; decSingle f; } u32;
|
|
|
490 decDouble f64;
|
|
|
491 decContext context;
|
|
|
492 INT_TYPE i;
|
|
|
493
|
|
|
494 decContextDefault (&context, DEC_INIT_DECIMAL128);
|
|
|
495 context.round = DEC_ROUND_DOWN;
|
|
|
496 u32.c = x;
|
|
|
497 f64 = *decSingleToWider (&u32.f, &f64);
|
|
|
498 i = DEC_FLOAT_TO_INT (&f64, &context, context.round);
|
|
|
499 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
500 dfp_conversion_exceptions (context.status);
|
|
|
501 return i;
|
|
|
502 }
|
|
|
503 #endif
|
|
|
504
|
|
|
505 #if defined (L_sd_to_di) || defined (L_dd_to_di) || defined (L_td_to_di) \
|
|
|
506 || defined (L_sd_to_udi) || defined (L_dd_to_udi) || defined (L_td_to_udi)
|
|
|
507 /* decNumber doesn't provide support for conversions to 64-bit integer
|
|
|
508 types, so do it the hard way. */
|
|
|
509 INT_TYPE
|
|
|
510 DFP_TO_INT (DFP_C_TYPE x)
|
|
|
511 {
|
|
|
512 /* decNumber's decimal* types have the same format as C's _Decimal*
|
|
|
513 types, but they have different calling conventions. */
|
|
|
514
|
|
|
515 /* TODO: Decimal float to integer conversions should raise FE_INVALID
|
|
|
516 if the result value does not fit into the result type. */
|
|
|
517
|
|
|
518 IEEE_TYPE s;
|
|
|
519 char buf[BUFMAX];
|
|
|
520 char *pos;
|
|
|
521 decNumber qval, n1, n2;
|
|
|
522 decContext context;
|
|
|
523
|
|
|
524 /* Use a large context to avoid losing precision. */
|
|
|
525 decContextDefault (&context, DEC_INIT_DECIMAL128);
|
|
|
526 /* Need non-default rounding mode here. */
|
|
|
527 context.round = DEC_ROUND_DOWN;
|
|
|
528
|
|
|
529 HOST_TO_IEEE (x, &s);
|
|
|
530 TO_INTERNAL (&s, &n1);
|
|
|
531 /* Rescale if the exponent is less than zero. */
|
|
|
532 decNumberToIntegralValue (&n2, &n1, &context);
|
|
|
533 /* Get a value to use for the quantize call. */
|
|
|
534 decNumberFromString (&qval, "1.", &context);
|
|
|
535 /* Force the exponent to zero. */
|
|
|
536 decNumberQuantize (&n1, &n2, &qval, &context);
|
|
|
537 /* Get a string, which at this point will not include an exponent. */
|
|
|
538 decNumberToString (&n1, buf);
|
|
|
539 /* Ignore the fractional part. */
|
|
|
540 pos = strchr (buf, '.');
|
|
|
541 if (pos)
|
|
|
542 *pos = 0;
|
|
|
543 /* Use a C library function to convert to the integral type. */
|
|
|
544 return STR_TO_INT (buf, NULL, 10);
|
|
|
545 }
|
|
|
546 #endif
|
|
|
547
|
|
|
548 #if defined (L_si_to_dd) || defined (L_si_to_td) \
|
|
|
549 || defined (L_usi_to_dd) || defined (L_usi_to_td)
|
|
|
550 /* Use decNumber to convert directly from integer to decimal float types. */
|
|
|
551 DFP_C_TYPE
|
|
|
552 INT_TO_DFP (INT_TYPE i)
|
|
|
553 {
|
|
|
554 union { DFP_C_TYPE c; decFloat f; } u;
|
|
|
555
|
|
|
556 u.f = *DEC_FLOAT_FROM_INT (&u.f, i);
|
|
|
557 return u.c;
|
|
|
558 }
|
|
|
559 #endif
|
|
|
560
|
|
|
561 #if defined (L_si_to_sd) || defined (L_usi_to_sd)
|
|
|
562 _Decimal32
|
|
|
563 /* Use decNumber to convert directly from integer to decimal float types. */
|
|
|
564 INT_TO_DFP (INT_TYPE i)
|
|
|
565 {
|
|
|
566 union { _Decimal32 c; decSingle f; } u32;
|
|
|
567 decDouble f64;
|
|
|
568 decContext context;
|
|
|
569
|
|
|
570 decContextDefault (&context, DEC_INIT_DECIMAL128);
|
|
|
571 context.round = DEC_ROUND_DOWN;
|
|
|
572 f64 = *DEC_FLOAT_FROM_INT (&f64, i);
|
|
|
573 u32.f = *decSingleFromWider (&u32.f, &f64, &context);
|
|
|
574 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
575 dfp_conversion_exceptions (context.status);
|
|
|
576 return u32.c;
|
|
|
577 }
|
|
|
578 #endif
|
|
|
579
|
|
|
580 #if defined (L_di_to_sd) || defined (L_di_to_dd) || defined (L_di_to_td) \
|
|
|
581 || defined (L_udi_to_sd) || defined (L_udi_to_dd) || defined (L_udi_to_td)
|
|
|
582 /* decNumber doesn't provide support for conversions from 64-bit integer
|
|
|
583 types, so do it the hard way. */
|
|
|
584 DFP_C_TYPE
|
|
|
585 INT_TO_DFP (INT_TYPE i)
|
|
|
586 {
|
|
|
587 DFP_C_TYPE f;
|
|
|
588 IEEE_TYPE s;
|
|
|
589 char buf[BUFMAX];
|
|
|
590 decContext context;
|
|
|
591
|
|
|
592 decContextDefault (&context, CONTEXT_INIT);
|
|
|
593 DFP_INIT_ROUNDMODE (context.round);
|
|
|
594
|
|
|
595 /* Use a C library function to get a floating point string. */
|
|
|
596 sprintf (buf, INT_FMT ".0", CAST_FOR_FMT(i));
|
|
|
597 /* Convert from the floating point string to a decimal* type. */
|
|
|
598 FROM_STRING (&s, buf, &context);
|
|
|
599 IEEE_TO_HOST (s, &f);
|
|
|
600
|
|
|
601 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
602 dfp_conversion_exceptions (context.status);
|
|
|
603
|
|
|
604 return f;
|
|
|
605 }
|
|
|
606 #endif
|
|
|
607
|
|
|
608 #if defined (L_sd_to_sf) || defined (L_dd_to_sf) || defined (L_td_to_sf) \
|
|
|
609 || defined (L_sd_to_df) || defined (L_dd_to_df) || defined (L_td_to_df) \
|
|
|
610 || ((defined (L_sd_to_xf) || defined (L_dd_to_xf) || defined (L_td_to_xf)) \
|
|
|
611 && LONG_DOUBLE_HAS_XF_MODE) \
|
|
|
612 || ((defined (L_sd_to_tf) || defined (L_dd_to_tf) || defined (L_td_to_tf)) \
|
|
|
613 && LONG_DOUBLE_HAS_TF_MODE)
|
|
|
614 BFP_TYPE
|
|
|
615 DFP_TO_BFP (DFP_C_TYPE f)
|
|
|
616 {
|
|
|
617 IEEE_TYPE s;
|
|
|
618 char buf[BUFMAX];
|
|
|
619
|
|
|
620 HOST_TO_IEEE (f, &s);
|
|
|
621 /* Write the value to a string. */
|
|
|
622 TO_STRING (&s, buf);
|
|
|
623 /* Read it as the binary floating point type and return that. */
|
|
|
624 return STR_TO_BFP (buf, NULL);
|
|
|
625 }
|
|
|
626 #endif
|
|
|
627
|
|
|
628 #if defined (L_sf_to_sd) || defined (L_sf_to_dd) || defined (L_sf_to_td) \
|
|
|
629 || defined (L_df_to_sd) || defined (L_df_to_dd) || defined (L_df_to_td) \
|
|
|
630 || ((defined (L_xf_to_sd) || defined (L_xf_to_dd) || defined (L_xf_to_td)) \
|
|
|
631 && LONG_DOUBLE_HAS_XF_MODE) \
|
|
|
632 || ((defined (L_tf_to_sd) || defined (L_tf_to_dd) || defined (L_tf_to_td)) \
|
|
|
633 && LONG_DOUBLE_HAS_TF_MODE)
|
|
|
634 DFP_C_TYPE
|
|
|
635 BFP_TO_DFP (BFP_TYPE x)
|
|
|
636 {
|
|
|
637 DFP_C_TYPE f;
|
|
|
638 IEEE_TYPE s;
|
|
|
639 char buf[BUFMAX];
|
|
|
640 decContext context;
|
|
|
641
|
|
|
642 decContextDefault (&context, CONTEXT_INIT);
|
|
|
643 DFP_INIT_ROUNDMODE (context.round);
|
|
|
644
|
|
|
645 /* Use a C library function to write the floating point value to a string. */
|
|
|
646 sprintf (buf, BFP_FMT, (BFP_VIA_TYPE) x);
|
|
|
647
|
|
|
648 /* Convert from the floating point string to a decimal* type. */
|
|
|
649 FROM_STRING (&s, buf, &context);
|
|
|
650 IEEE_TO_HOST (s, &f);
|
|
|
651
|
|
|
652 if (DFP_EXCEPTIONS_ENABLED && context.status != 0)
|
|
|
653 {
|
|
|
654 /* decNumber exception flags we care about here. */
|
|
|
655 int ieee_flags;
|
|
|
656 int dec_flags = DEC_IEEE_854_Inexact | DEC_IEEE_854_Invalid_operation
|
|
|
657 | DEC_IEEE_854_Overflow | DEC_IEEE_854_Underflow;
|
|
|
658 dec_flags &= context.status;
|
|
|
659 ieee_flags = DFP_IEEE_FLAGS (dec_flags);
|
|
|
660 if (ieee_flags != 0)
|
|
|
661 DFP_HANDLE_EXCEPTIONS (ieee_flags);
|
|
|
662 }
|
|
|
663
|
|
|
664 return f;
|
|
|
665 }
|
|
|
666 #endif
|
|
|
667
|
|
|
668 #if defined (L_unord_sd) || defined (L_unord_dd) || defined (L_unord_td)
|
|
|
669 CMPtype
|
|
|
670 DFP_UNORD (DFP_C_TYPE arg_a, DFP_C_TYPE arg_b)
|
|
|
671 {
|
|
|
672 decNumber arg1, arg2;
|
|
|
673 IEEE_TYPE a, b;
|
|
|
674
|
|
|
675 HOST_TO_IEEE (arg_a, &a);
|
|
|
676 HOST_TO_IEEE (arg_b, &b);
|
|
|
677 TO_INTERNAL (&a, &arg1);
|
|
|
678 TO_INTERNAL (&b, &arg2);
|
|
|
679 return (decNumberIsNaN (&arg1) || decNumberIsNaN (&arg2));
|
|
|
680 }
|
|
|
681 #endif /* L_unord_sd || L_unord_dd || L_unord_td */
|
