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py/modmath: Convert log2 macro into a function.

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So that a pointer to it can be passed as a pointer to math_generic_1.  This
patch also makes the function work for single and double precision floating
point.
This commit is contained in:
Damien George 2017-10-04 21:46:38 +11:00
parent 25e140652b
commit d8d4e4dfbe
1 changed files with 5 additions and 1 deletions
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6
py/modmath.c
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@ -85,8 +85,12 @@ STATIC mp_obj_t math_generic_2(mp_obj_t x_obj, mp_obj_t y_obj, mp_float_t (*f)(m
STATIC MP_DEFINE_CONST_FUN_OBJ_2(mp_math_## py_name ## _obj, mp_math_ ## py_name);
#if MP_NEED_LOG2
#undef log2
#undef log2f
// 1.442695040888963407354163704 is 1/_M_LN2
#define log2(x) (log(x) * 1.442695040888963407354163704)
mp_float_t MICROPY_FLOAT_C_FUN(log2)(mp_float_t x) {
return MICROPY_FLOAT_C_FUN(log)(x) * MICROPY_FLOAT_CONST(1.442695040888963407354163704);
}
#endif
// sqrt(x): returns the square root of x