/* real.c - implementation of REAL_ARITHMETIC, REAL_VALUE_ATOF,
and support for XFmode IEEE extended real floating point arithmetic.
- Contributed by Stephen L. Moshier (moshier@world.std.com).
-
Copyright (C) 1993, 1994 Free Software Foundation, Inc.
+ Contributed by Stephen L. Moshier (moshier@world.std.com).
This file is part of GNU CC.
}
-/*
-; Find signed HOST_WIDE_INT integer and floating point fractional parts
-
-; HOST_WIDE_INT i;
-; unsigned EMUSHORT x[NE], frac[NE];
-; xifrac (x, &i, frac);
+/* Find signed HOST_WIDE_INT integer and floating point fractional
+ parts of e-type (packed internal format) floating point input X.
+ The integer output I has the sign of the input, except that
+ positive overflow is permitted if FIXUNS_TRUNC_LIKE_FIX_TRUNC.
+ The output e-type fraction FRAC is the positive fractional
+ part of abs (X). */
- The integer output has the sign of the input. The fraction is
-the positive fractional part of abs (x).
-*/
void
eifrac (x, i, frac)
unsigned EMUSHORT *x;
if (xi[0])
*i = ((unsigned HOST_WIDE_INT) 1) << (HOST_BITS_PER_WIDE_INT - 1);
else
- *i = (((unsigned HOST_WIDE_INT) 1) << (HOST_BITS_PER_WIDE_INT - 1)) - 1;
+ {
+#ifdef FIXUNS_TRUNC_LIKE_FIX_TRUNC
+ /* In this case, let it overflow and convert as if unsigned. */
+ euifrac (x, &ll, frac);
+ *i = (HOST_WIDE_INT) ll;
+ return;
+#else
+ /* In other cases, return the largest positive integer. */
+ *i = (((unsigned HOST_WIDE_INT) 1) << (HOST_BITS_PER_WIDE_INT - 1)) - 1;
+#endif
+ }
eshift (xi, k);
if (extra_warnings)
warning ("overflow on truncation to integer");