diff options
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c')
-rw-r--r-- | Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c b/Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c index 9c9168a5a91..700e0172a0a 100644 --- a/Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c +++ b/Build/source/libs/mpfr/mpfr-src/src/uceil_log2.c @@ -24,40 +24,44 @@ http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc., /* returns ceil(log(d)/log(2)) if d > 0, -1023 if d = +0, - and floor(log(-d)/log(2))+1 if d < 0*/ + and floor(log(-d)/log(2))+1 if d < 0 +*/ long __gmpfr_ceil_log2 (double d) { long exp; -#if _GMP_IEEE_FLOATS - union ieee_double_extract x; +#if _MPFR_IEEE_FLOATS + union mpfr_ieee_double_extract x; x.d = d; - exp = x.s.exp - 1023; + /* 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 */ x.s.exp = 1023; /* value for 1 <= d < 2 */ if (x.d != 1.0) /* d: not a power of two? */ exp++; return exp; -#else +#else /* _MPFR_IEEE_FLOATS */ double m; if (d < 0.0) - return __gmpfr_floor_log2(-d)+1; + return __gmpfr_floor_log2 (-d) + 1; else if (d == 0.0) return -1023; else if (d >= 1.0) { exp = 0; - for( m= 1.0 ; m < d ; m *=2.0 ) + for (m = 1.0; m < d; m *= 2.0) exp++; } else { exp = 1; - for( m= 1.0 ; m >= d ; m *= (1.0/2.0) ) + for (m = 1.0; m >= d; m *= 0.5) exp--; } -#endif +#endif /* _MPFR_IEEE_FLOATS */ return exp; } |