comparison: src/cx/utils.h
src/cx/utils.h
- changeset 628
- 1e2be40f0cb5
- parent 527
- 08539b8273fa
- child 646
- dfd0403ff8b6
- child 649
- 12c2b10b51a9
equal
deleted
inserted
replaced
| 627:cc8cbabd27cd | 628:1e2be40f0cb5 |
|---|---|
| 49 /** | 49 /** |
| 50 * Convenience macro for a for loop that counts from zero to n-1. | 50 * Convenience macro for a for loop that counts from zero to n-1. |
| 51 */ | 51 */ |
| 52 #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++) | 52 #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++) |
| 53 | 53 |
| 54 /* ---------------------- | 54 // cx_szmul() definition |
| 55 * cx_szmul() definition. | |
| 56 * ---------------------- */ | |
| 57 | 55 |
| 58 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) | 56 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) |
| 59 #define CX_SZMUL_BUILTIN | 57 #define CX_SZMUL_BUILTIN |
| 60 | 58 |
| 61 #if __WORDSIZE == 32 | 59 #if __WORDSIZE == 32 |
| 70 * be stored | 68 * be stored |
| 71 * @return zero, if no overflow occurred and the result is correct, non-zero | 69 * @return zero, if no overflow occurred and the result is correct, non-zero |
| 72 * otherwise | 70 * otherwise |
| 73 */ | 71 */ |
| 74 #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result) | 72 #define cx_szmul(a, b, result) __builtin_umul_overflow(a, b, result) |
| 75 #else /* __WORDSIZE != 32 */ | 73 #else // __WORDSIZE != 32 |
| 76 /** | 74 /** |
| 77 * Alias for \c __builtin_umull_overflow. | 75 * Alias for \c __builtin_umull_overflow. |
| 78 * | 76 * |
| 79 * Performs a multiplication of size_t values and checks for overflow. | 77 * Performs a multiplication of size_t values and checks for overflow. |
| 80 * | 78 * |
| 84 * be stored | 82 * be stored |
| 85 * @return zero, if no overflow occurred and the result is correct, non-zero | 83 * @return zero, if no overflow occurred and the result is correct, non-zero |
| 86 * otherwise | 84 * otherwise |
| 87 */ | 85 */ |
| 88 #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) | 86 #define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result) |
| 89 #endif /* __WORDSIZE */ | 87 #endif // __WORDSIZE |
| 90 | 88 |
| 91 #else /* no GNUC or clang bultin */ | 89 #else // no GNUC or clang bultin |
| 92 | 90 |
| 93 /** | 91 /** |
| 94 * Performs a multiplication of size_t values and checks for overflow. | 92 * Performs a multiplication of size_t values and checks for overflow. |
| 95 * | 93 * |
| 96 * @param a first operand | 94 * @param a first operand |
| 120 | 118 |
| 121 #ifdef __cplusplus | 119 #ifdef __cplusplus |
| 122 } | 120 } |
| 123 #endif | 121 #endif |
| 124 | 122 |
| 125 #endif /* UCX_UTILS_H */ | 123 #endif // UCX_UTILS_H |
