diff options
Diffstat (limited to 'py/mpconfig.h')
| -rw-r--r-- | py/mpconfig.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h index 98e9406c6..4f023934e 100644 --- a/py/mpconfig.h +++ b/py/mpconfig.h @@ -63,14 +63,17 @@ // - xxxx...xxx0 : a pointer to an mp_obj_base_t (unless a fake object) #define MICROPY_OBJ_REPR_B (1) -// A MicroPython object is a machine word having the following form: +// A MicroPython object is a machine word having the following form (called R): // - iiiiiiii iiiiiiii iiiiiiii iiiiiii1 small int with 31-bit signed value -// - x1111111 1qqqqqqq qqqqqqqq qqqqq110 str with 20-bit qstr value +// - 01111111 1qqqqqqq qqqqqqqq qqqqq110 str with 20-bit qstr value // - s1111111 10000000 00000000 00000010 +/- inf // - s1111111 1xxxxxxx xxxxxxxx xxxxx010 nan, x != 0 // - seeeeeee efffffff ffffffff ffffff10 30-bit fp, e != 0xff // - pppppppp pppppppp pppppppp pppppp00 ptr (4 byte alignment) +// Str and float stored as O = R + 0x80800000, retrieved as R = O - 0x80800000. +// This makes strs easier to encode/decode as they have zeros in the top 9 bits. // This scheme only works with 32-bit word size and float enabled. + #define MICROPY_OBJ_REPR_C (2) #ifndef MICROPY_OBJ_REPR |