diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c b/Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c index bae86087222..5101b74ce3d 100644 --- a/Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c +++ b/Build/source/libs/mpfr/mpfr-src/src/ufloor_log2.c @@ -26,28 +26,32 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., long __gmpfr_floor_log2 (double d) { -#if _GMP_IEEE_FLOATS - union ieee_double_extract x; + long exp; +#if _MPFR_IEEE_FLOATS + union mpfr_ieee_double_extract x; x.d = d; - return (long) x.s.exp - 1023; -#else - long exp; + /* The cast below is useless in theory, but let us not depend on the + integer promotion rules (for instance, tcc is currently wrong). */ + exp = (long) x.s.exp - 1023; + MPFR_ASSERTN (exp < 1023); /* fail on infinities */ + return exp; +#else /* _MPFR_IEEE_FLOATS */ double m; MPFR_ASSERTD (d >= 0); if (d >= 1.0) { exp = -1; - for( m= 1.0 ; m <= d ; m *=2.0 ) + for (m = 1.0; m <= d; m *= 2.0) exp++; } else { exp = 0; - for( m= 1.0 ; m > d ; m *= (1.0/2.0) ) + for (m = 1.0; m > d; m *= 0.5) exp--; } return exp; -#endif +#endif /* _MPFR_IEEE_FLOATS */ } |