diff options
Diffstat (limited to 'src/math/scalbn.c')
| -rw-r--r-- | src/math/scalbn.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/src/math/scalbn.c b/src/math/scalbn.c index 1fec432f..530e07c7 100644 --- a/src/math/scalbn.c +++ b/src/math/scalbn.c @@ -1,29 +1,31 @@ -#include "libm.h" +#include <math.h> +#include <stdint.h> double scalbn(double x, int n) { - double scale; + union {double f; uint64_t i;} u; + double_t y = x; if (n > 1023) { - x *= 0x1p1023; + y *= 0x1p1023; n -= 1023; if (n > 1023) { - x *= 0x1p1023; + y *= 0x1p1023; n -= 1023; if (n > 1023) n = 1023; } } else if (n < -1022) { - x *= 0x1p-1022; + y *= 0x1p-1022; n += 1022; if (n < -1022) { - x *= 0x1p-1022; + y *= 0x1p-1022; n += 1022; if (n < -1022) n = -1022; } } - INSERT_WORDS(scale, (uint32_t)(0x3ff+n)<<20, 0); - STRICT_ASSIGN(double, x, x * scale); + u.i = (uint64_t)(0x3ff+n)<<52; + x = y * u.f; return x; } |