/* Emulation for ldexpl.
Contributed by Paolo Bonzini
- Copyright 2002, 2003, 2007 Free Software Foundation, Inc.
+ Copyright 2002-2003, 2007-2011 Free Software Foundation, Inc.
This file is part of gnulib.
/* Specification. */
#include <math.h>
-#include <float.h>
-#include "fpucw.h"
-#include "isnanl.h"
+#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
long double
-ldexpl(long double x, int exp)
+ldexpl (long double x, int exp)
+{
+ return ldexp (x, exp);
+}
+
+#else
+
+# include <float.h>
+# include "fpucw.h"
+
+long double
+ldexpl (long double x, int exp)
{
long double factor;
int bit;
if (!(isnanl (x) || x + x == x))
{
if (exp < 0)
- {
- exp = -exp;
- factor = 0.5L;
- }
+ {
+ exp = -exp;
+ factor = 0.5L;
+ }
else
- factor = 2.0L;
+ factor = 2.0L;
if (exp > 0)
- for (bit = 1;;)
- {
- /* Invariant: Here bit = 2^i, factor = 2^-2^i or = 2^2^i,
- and bit <= exp. */
- if (exp & bit)
- x *= factor;
- bit <<= 1;
- if (bit > exp)
- break;
- factor = factor * factor;
- }
+ for (bit = 1;;)
+ {
+ /* Invariant: Here bit = 2^i, factor = 2^-2^i or = 2^2^i,
+ and bit <= exp. */
+ if (exp & bit)
+ x *= factor;
+ bit <<= 1;
+ if (bit > exp)
+ break;
+ factor = factor * factor;
+ }
}
END_LONG_DOUBLE_ROUNDING ();
return x;
}
+#endif
+
#if 0
int
main (void)
long double x;
int y;
for (y = 0; y < 29; y++)
- printf ("%5d %.16Lg %.16Lg\n", y, ldexpl(0.8L, y), ldexpl(0.8L, -y) * ldexpl(0.8L, y));
+ printf ("%5d %.16Lg %.16Lg\n", y, ldexpl (0.8L, y), ldexpl (0.8L, -y) * ldexpl (0.8L, y));
}
#endif