diff options
Diffstat (limited to 'py/objfloat.c')
| -rw-r--r-- | py/objfloat.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/py/objfloat.c b/py/objfloat.c index 80f10e816..329a8b90e 100644 --- a/py/objfloat.c +++ b/py/objfloat.c @@ -340,6 +340,15 @@ mp_float_t uint64_to_float(uint64_t ui64) { return (mp_float_t) ((uint32_t) (ui64 >> 32) * 4294967296.0f + (uint32_t) (ui64 & 0xffffffff)); } +// Convert a uint64_t to a 32-bit float to a uint64_t without invoking extra math routines. +// which are large. +// Assume f >= 0. +uint64_t float_to_uint64(float f) { + // 4294967296 = 2^32 + const uint32_t upper_half = (uint32_t) (f / 4294967296.0f); + const uint32_t lower_half = (uint32_t) f; + return (((uint64_t) upper_half) << 32) + lower_half; +} #pragma GCC diagnostic pop #endif // MICROPY_PY_BUILTINS_FLOAT |