Nils O. Selåsdal
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
#include <stdint.h>
|
|
|
|
/** Implementation of saturated operation on uintaa_t.
|
|
* Opaerations are clamped betweehn 0 and UINTaa_MAa instead of
|
|
* wrapping around*/
|
|
|
|
#define UC_SAT_ADD(a, b, type, max_val)\
|
|
((type)((a) + (b)) >= (a) ? (a) + (b) : (max_val))
|
|
|
|
#define UC_SAT_SUB(a, b)\
|
|
(a >= b ? (a) - (b) : 0)
|
|
|
|
#define UC_SAT_MULT(a, b, type, max_val)\
|
|
((b) == 0 ? 0 :\
|
|
(a) <= (max_val) / (b) ? (type) (a) * (type) (b) \
|
|
: (max_val))
|
|
|
|
|
|
static inline uint8_t uc_sat_addu8(uint8_t a, uint8_t b)
|
|
{
|
|
return UC_SAT_ADD(a, b, uint8_t, UINT8_MAX);
|
|
}
|
|
|
|
static inline uint8_t uc_sat_subu8(uint8_t a, uint8_t b)
|
|
{
|
|
return UC_SAT_SUB(a, b);
|
|
}
|
|
|
|
static inline uint8_t uc_sat_multu8(uint8_t a, uint8_t b)
|
|
{
|
|
return UC_SAT_MULT(a, b, uint8_t, UINT8_MAX);
|
|
}
|
|
|
|
static inline uint16_t uc_sat_addu16(uint16_t a, uint16_t b)
|
|
{
|
|
return UC_SAT_ADD(a, b, uint16_t, UINT16_MAX);
|
|
}
|
|
|
|
static inline uint16_t uc_sat_subu16(uint16_t a, uint16_t b)
|
|
{
|
|
return UC_SAT_SUB(a, b);
|
|
}
|
|
|
|
static inline uint16_t uc_sat_multu16(uint16_t a, uint16_t b)
|
|
{
|
|
return UC_SAT_MULT(a, b, uint16_t, UINT16_MAX);
|
|
}
|
|
|
|
static inline uint32_t uc_sat_addu32(uint32_t a, uint32_t b)
|
|
{
|
|
return UC_SAT_ADD(a, b, uint32_t, UINT32_MAX);
|
|
}
|
|
|
|
static inline uint32_t uc_sat_subu32(uint32_t a, uint32_t b)
|
|
{
|
|
return UC_SAT_SUB(a, b);
|
|
}
|
|
|
|
static inline uint32_t uc_sat_multu32(uint32_t a, uint32_t b)
|
|
{
|
|
return UC_SAT_MULT(a, b, uint32_t, UINT32_MAX);
|
|
}
|
|
|
|
static inline uint64_t uc_sat_addu64(uint64_t a, uint64_t b)
|
|
{
|
|
return UC_SAT_ADD(a, b, uint64_t, UINT64_MAX);
|
|
}
|
|
|
|
static inline uint64_t uc_sat_subu64(uint64_t a, uint64_t b)
|
|
{
|
|
return UC_SAT_SUB(a, b);
|
|
}
|
|
|
|
static inline uint64_t uc_sat_multu64(uint64_t a, uint64_t b)
|
|
{
|
|
return UC_SAT_MULT(a, b, uint64_t, UINT64_MAX);
|
|
}
|
|
|