diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/runtime/c/gu/bits.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/src/runtime/c/gu/bits.c b/src/runtime/c/gu/bits.c index 21ef71246..b5696a19c 100644 --- a/src/runtime/c/gu/bits.c +++ b/src/runtime/c/gu/bits.c @@ -45,9 +45,9 @@ gu_decode_double(uint64_t u) GU_INTERNAL uint64_t gu_encode_double(double d) { - int sign = (d < 0) ? 1 : 0; - int rawexp; - double mantissa; + int sign = signbit(d) > 0; + unsigned rawexp; + uint64_t mantissa; switch (fpclassify(d)) { case FP_NAN: @@ -58,14 +58,19 @@ gu_encode_double(double d) rawexp = 0x7ff; mantissa = 0; break; - default: - mantissa = frexp(d, &rawexp); - rawexp += 1075; + default: { + int exp; + mantissa = (uint64_t) scalbn(frexp(d, &exp), 53); + mantissa &= ~ (1ULL << 52); + exp -= 53; + + rawexp = exp + 1075; + } } uint64_t u = (((uint64_t) sign) << 63) | - ((((uint64_t) rawexp) << 52) & 0x7ff) | - ((uint64_t) mantissa); + (((uint64_t) rawexp & 0x7ff) << 52) | + mantissa; return u; } |