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py: Fix handling of NaN in certain pow implementations.

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Adds a new compile-time option MICROPY_PY_MATH_POW_FIX_NAN for use with
toolchains that don't handle pow-of-NaN correctly.
This commit is contained in:
stijn
2020-09-08 15:22:34 +02:00
committed by Damien George
parent 8d5a40c86e
commit 2e54d9d146
5 changed files with 26 additions and 1 deletions
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12
py/modmath.c
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@@ -98,7 +98,19 @@ mp_float_t MICROPY_FLOAT_C_FUN(log2)(mp_float_t x) {
// sqrt(x): returns the square root of x
MATH_FUN_1(sqrt, sqrt)
// pow(x, y): returns x to the power of y
#if MICROPY_PY_MATH_POW_FIX_NAN
mp_float_t pow_func(mp_float_t x, mp_float_t y) {
// pow(base, 0) returns 1 for any base, even when base is NaN
// pow(+1, exponent) returns 1 for any exponent, even when exponent is NaN
if (x == MICROPY_FLOAT_CONST(1.0) || y == MICROPY_FLOAT_CONST(0.0)) {
return MICROPY_FLOAT_CONST(1.0);
}
return MICROPY_FLOAT_C_FUN(pow)(x, y);
}
MATH_FUN_2(pow, pow_func)
#else
MATH_FUN_2(pow, pow)
#endif
// exp(x)
MATH_FUN_1(exp, exp)
#if MICROPY_PY_MATH_SPECIAL_FUNCTIONS