comparison: src/ucx/ucx.h
src/ucx/ucx.h
- changeset 303
- 362679052788
- parent 283
- c3b6ff227481
- child 306
- 90b6d69bb499
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| 302:8628147734d6 | 303:362679052788 |
|---|---|
| 133 | 133 |
| 134 | 134 |
| 135 | 135 |
| 136 #if defined(__GNUC__) || defined(__clang__) | 136 #if defined(__GNUC__) || defined(__clang__) |
| 137 #define UCX_MUL_BUILTIN | 137 #define UCX_MUL_BUILTIN |
| 138 | |
| 139 #if __WORDSIZE == 32 | |
| 140 /** | |
| 141 * Alias for <code>__builtin_umul_overflow</code>. | |
| 142 * | |
| 143 * Performs a multiplication of size_t values and checks for overflow. | |
| 144 * | |
| 145 * @param a first operand | |
| 146 * @param b second operand | |
| 147 * @param result a pointer to a size_t, where the result should | |
| 148 * be stored | |
| 149 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 150 * otherwise | |
| 151 */ | |
| 152 #define ucx_szmul(a, b, result) __builtin_umul_overflow(a, b, result) | |
| 153 #else /* __WORDSIZE != 32 */ | |
| 154 /** | |
| 155 * Alias for <code>__builtin_umull_overflow</code>. | |
| 156 * | |
| 157 * Performs a multiplication of size_t values and checks for overflow. | |
| 158 * | |
| 159 * @param a first operand | |
| 160 * @param b second operand | |
| 161 * @param result a pointer to a size_t, where the result should | |
| 162 * be stored | |
| 163 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 164 * otherwise | |
| 165 */ | |
| 138 #define ucx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) | 166 #define ucx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) |
| 139 #else | 167 #endif /* __WORDSIZE */ |
| 168 | |
| 169 #else /* no GNUC or clang bultin */ | |
| 170 | |
| 171 /** | |
| 172 * Performs a multiplication of size_t values and checks for overflow. | |
| 173 * | |
| 174 * This is a custom implementation in case there is no compiler builtin | |
| 175 * available. | |
| 176 * | |
| 177 * @param a first operand | |
| 178 * @param b second operand | |
| 179 * @param result a pointer to a size_t, where the result should | |
| 180 * be stored | |
| 181 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 182 * otherwise | |
| 183 */ | |
| 140 int ucx_szmul(size_t a, size_t b, size_t *result); | 184 int ucx_szmul(size_t a, size_t b, size_t *result); |
| 185 | |
| 141 #endif | 186 #endif |
| 142 | 187 |
| 143 #ifdef __cplusplus | 188 #ifdef __cplusplus |
| 144 } | 189 } |
| 145 #endif | 190 #endif |
