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py: Allow configurable object representation, with 2 different options.

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Damien George
2015-03-29 14:05:46 +01:00
parent 12a5e17afb
commit 567184e21e
3 changed files with 78 additions and 26 deletions
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12
py/smallint.h
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@@ -32,10 +32,20 @@
// Functions for small integer arithmetic
// In SMALL_INT, next-to-highest bits is used as sign, so both must match for value in range
#if MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A
#define MP_SMALL_INT_MIN ((mp_int_t)(((mp_int_t)WORD_MSBIT_HIGH) >> 1))
#define MP_SMALL_INT_MAX ((mp_int_t)(~(MP_SMALL_INT_MIN)))
#define MP_SMALL_INT_FITS(n) ((((n) ^ ((n) << 1)) & WORD_MSBIT_HIGH) == 0)
#elif MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_B
#define MP_SMALL_INT_MIN ((mp_int_t)(((mp_int_t)WORD_MSBIT_HIGH) >> 2))
#define MP_SMALL_INT_FITS(n) ((((n) & MP_SMALL_INT_MIN) == 0) || (((n) & MP_SMALL_INT_MIN) == MP_SMALL_INT_MIN))
#endif
#define MP_SMALL_INT_MAX ((mp_int_t)(~(MP_SMALL_INT_MIN)))
bool mp_small_int_mul_overflow(mp_int_t x, mp_int_t y);
mp_int_t mp_small_int_modulo(mp_int_t dividend, mp_int_t divisor);
mp_int_t mp_small_int_floor_divide(mp_int_t num, mp_int_t denom);