comparison: src/cx/utils.h
src/cx/utils.h
- changeset 654
- c9d008861178
- parent 646
- dfd0403ff8b6
- parent 651
- 19d1a8422f6e
- child 674
- dc514a5d42a5
equal
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| 647:2e6e9d9f2159 | 654:c9d008861178 |
|---|---|
| 63 // cx_szmul() definition | 63 // cx_szmul() definition |
| 64 | 64 |
| 65 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) | 65 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) |
| 66 #define CX_SZMUL_BUILTIN | 66 #define CX_SZMUL_BUILTIN |
| 67 | 67 |
| 68 #if __WORDSIZE == 32 | |
| 69 /** | 68 /** |
| 70 * Alias for \c __builtin_umul_overflow. | 69 * Alias for \c __builtin_mul_overflow. |
| 71 * | 70 * |
| 72 * Performs a multiplication of size_t values and checks for overflow. | 71 * Performs a multiplication of size_t values and checks for overflow. |
| 73 * | 72 * |
| 74 * @param a first operand | 73 * @param a first operand |
| 75 * @param b second operand | 74 * @param b second operand |
| 76 * @param result a pointer to a size_t, where the result should | 75 * @param result a pointer to a size_t, where the result should |
| 77 * be stored | 76 * be stored |
| 78 * @return zero, if no overflow occurred and the result is correct, non-zero | 77 * @return zero, if no overflow occurred and the result is correct, non-zero |
| 79 * otherwise | 78 * otherwise |
| 80 */ | 79 */ |
| 81 #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result) | 80 #define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result) |
| 82 #else // __WORDSIZE != 32 | |
| 83 /** | |
| 84 * Alias for \c __builtin_umull_overflow. | |
| 85 * | |
| 86 * Performs a multiplication of size_t values and checks for overflow. | |
| 87 * | |
| 88 * @param a first operand | |
| 89 * @param b second operand | |
| 90 * @param result a pointer to a size_t, where the result should | |
| 91 * be stored | |
| 92 * @return zero, if no overflow occurred and the result is correct, non-zero | |
| 93 * otherwise | |
| 94 */ | |
| 95 #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) | |
| 96 #endif // __WORDSIZE | |
| 97 | 81 |
| 98 #else // no GNUC or clang bultin | 82 #else // no GNUC or clang bultin |
| 99 | 83 |
| 100 /** | 84 /** |
| 101 * Performs a multiplication of size_t values and checks for overflow. | 85 * Performs a multiplication of size_t values and checks for overflow. |
