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py: Fix check of small-int overflow when parsing ints.

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Also unifies use of SMALL_INT_FITS macro across parser and runtime.
This commit is contained in:
Damien George
2014-05-28 14:51:12 +01:00
parent 813ed3bda6
commit d1e355ea8e
11 changed files with 37 additions and 34 deletions
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5
py/smallint.h
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@@ -26,6 +26,11 @@
// Functions for small integer arithmetic
// In SMALL_INT, next-to-highest bits is used as sign, so both must match for value in range
#define MP_SMALL_INT_MIN ((mp_small_int_t)(((machine_int_t)WORD_MSBIT_HIGH) >> 1))
#define MP_SMALL_INT_MAX ((mp_small_int_t)(~(MP_SMALL_INT_MIN)))
#define MP_SMALL_INT_FITS(n) ((((n) ^ ((n) << 1)) & WORD_MSBIT_HIGH) == 0)
bool mp_small_int_mul_overflow(machine_int_t x, machine_int_t y);
machine_int_t mp_small_int_modulo(machine_int_t dividend, machine_int_t divisor);
machine_int_t mp_small_int_floor_divide(machine_int_t num, machine_int_t denom);