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mbed I/F binding for mruby

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include/mruby/numeric.h@0:158c61bb030f, 2015-03-25 (annotated)

Committer:
mzta
Date:
Wed Mar 25 17:36:16 2015 +0000
Revision:
0:158c61bb030f
mirb_mbed initial commit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mzta 0:158c61bb030f 1 /*
mzta 0:158c61bb030f 2 ** mruby/numeric.h - Numeric, Integer, Float, Fixnum class
mzta 0:158c61bb030f 3 **
mzta 0:158c61bb030f 4 ** See Copyright Notice in mruby.h
mzta 0:158c61bb030f 5 */
mzta 0:158c61bb030f 6
mzta 0:158c61bb030f 7 #ifndef MRUBY_NUMERIC_H
mzta 0:158c61bb030f 8 #define MRUBY_NUMERIC_H
mzta 0:158c61bb030f 9
mzta 0:158c61bb030f 10 #if defined(__cplusplus)
mzta 0:158c61bb030f 11 extern "C" {
mzta 0:158c61bb030f 12 #endif
mzta 0:158c61bb030f 13
mzta 0:158c61bb030f 14 #define POSFIXABLE(f) ((f) <= MRB_INT_MAX)
mzta 0:158c61bb030f 15 #define NEGFIXABLE(f) ((f) >= MRB_INT_MIN)
mzta 0:158c61bb030f 16 #define FIXABLE(f) (POSFIXABLE(f) && NEGFIXABLE(f))
mzta 0:158c61bb030f 17
mzta 0:158c61bb030f 18 MRB_API mrb_value mrb_flo_to_fixnum(mrb_state *mrb, mrb_value val);
mzta 0:158c61bb030f 19 MRB_API mrb_value mrb_fixnum_to_str(mrb_state *mrb, mrb_value x, int base);
mzta 0:158c61bb030f 20 MRB_API mrb_float mrb_to_flo(mrb_state *mrb, mrb_value x);
mzta 0:158c61bb030f 21
mzta 0:158c61bb030f 22 mrb_value mrb_fixnum_plus(mrb_state *mrb, mrb_value x, mrb_value y);
mzta 0:158c61bb030f 23 mrb_value mrb_fixnum_minus(mrb_state *mrb, mrb_value x, mrb_value y);
mzta 0:158c61bb030f 24 mrb_value mrb_fixnum_mul(mrb_state *mrb, mrb_value x, mrb_value y);
mzta 0:158c61bb030f 25 mrb_value mrb_num_div(mrb_state *mrb, mrb_value x, mrb_value y);
mzta 0:158c61bb030f 26
mzta 0:158c61bb030f 27 #define MRB_UINT_MAKE2(n) uint ## n ## _t
mzta 0:158c61bb030f 28 #define MRB_UINT_MAKE(n) MRB_UINT_MAKE2(n)
mzta 0:158c61bb030f 29 #define mrb_uint MRB_UINT_MAKE(MRB_INT_BIT)
mzta 0:158c61bb030f 30
mzta 0:158c61bb030f 31 #ifdef MRB_WORD_BOXING
mzta 0:158c61bb030f 32 # define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1 - MRB_FIXNUM_SHIFT))
mzta 0:158c61bb030f 33 #else
mzta 0:158c61bb030f 34 # define MRB_INT_OVERFLOW_MASK ((mrb_uint)1 << (MRB_INT_BIT - 1))
mzta 0:158c61bb030f 35 #endif
mzta 0:158c61bb030f 36
mzta 0:158c61bb030f 37 static inline mrb_bool
mzta 0:158c61bb030f 38 mrb_int_add_overflow(mrb_int augend, mrb_int addend, mrb_int *sum)
mzta 0:158c61bb030f 39 {
mzta 0:158c61bb030f 40 mrb_uint x = (mrb_uint)augend;
mzta 0:158c61bb030f 41 mrb_uint y = (mrb_uint)addend;
mzta 0:158c61bb030f 42 mrb_uint z = (mrb_uint)(x + y);
mzta 0:158c61bb030f 43 *sum = (mrb_int)z;
mzta 0:158c61bb030f 44 return !!(((x ^ z) & (y ^ z)) & MRB_INT_OVERFLOW_MASK);
mzta 0:158c61bb030f 45 }
mzta 0:158c61bb030f 46
mzta 0:158c61bb030f 47 static inline mrb_bool
mzta 0:158c61bb030f 48 mrb_int_sub_overflow(mrb_int minuend, mrb_int subtrahend, mrb_int *difference)
mzta 0:158c61bb030f 49 {
mzta 0:158c61bb030f 50 mrb_uint x = (mrb_uint)minuend;
mzta 0:158c61bb030f 51 mrb_uint y = (mrb_uint)subtrahend;
mzta 0:158c61bb030f 52 mrb_uint z = (mrb_uint)(x - y);
mzta 0:158c61bb030f 53 *difference = (mrb_int)z;
mzta 0:158c61bb030f 54 return !!(((x ^ z) & (~y ^ z)) & MRB_INT_OVERFLOW_MASK);
mzta 0:158c61bb030f 55 }
mzta 0:158c61bb030f 56
mzta 0:158c61bb030f 57 #undef MRB_INT_OVERFLOW_MASK
mzta 0:158c61bb030f 58 #undef mrb_uint
mzta 0:158c61bb030f 59 #undef MRB_UINT_MAKE
mzta 0:158c61bb030f 60 #undef MRB_UINT_MAKE2
mzta 0:158c61bb030f 61
mzta 0:158c61bb030f 62 #if defined(__cplusplus)
mzta 0:158c61bb030f 63 } /* extern "C" { */
mzta 0:158c61bb030f 64 #endif
mzta 0:158c61bb030f 65
mzta 0:158c61bb030f 66 #endif /* MRUBY_NUMERIC_H */
mzta 0:158c61bb030f 67