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-rw-r--r--sysdeps/libm-ieee754/s_roundtoll.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_roundtoll.c b/sysdeps/libm-ieee754/s_roundtoll.c
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+/* Round long double value to long long int.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <math.h>
+
+#include "math_private.h"
+
+
+#ifdef NO_LONG_DOUBLE
+/* The `long double' is in fact the IEEE `double' type. */
+
+long long int
+__roundtoll (long double x)
+{
+ int32_t j0;
+ u_int32_t i1, i0;
+ long long int result;
+
+ EXTRACT_WORDS (i0, i1, x);
+ j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+ if (j0 < 20)
+ {
+ if (j0 < 0)
+ result = j0 < -1 ? 0 : ((i0 & 0x80000000) ? -1 : 1);
+ else
+ {
+ u_int32_t i = 0xfffff >> j0;
+ if (((i0 & i) | i1) == 0)
+ result = (long long int) ((i0 & 0xfffff) | 0x100000) >> j0;
+ else
+ {
+ /* X is not integral. */
+ u_int32_t j = i0 + (0x80000 >> j0);
+ if (j < i0)
+ result = (long long int) 0x80000 >> (20 - j0);
+ else
+ result = (j | 0x100000) >> (20 - j0);
+ }
+ }
+ }
+ else if (j0 >= 8 * sizeof (long long int) || j0 > 51)
+ {
+ /* The number is too large. It is left implementation defined
+ what happens. */
+ result = (long long int) x;
+ }
+ else
+ {
+ i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
+ if ((i1 & i) != 0)
+ {
+ /* x is not integral. */
+ u_int32_t j = i1 + (0x80000000 >> (j0 - 20));
+ if (j < i1)
+ {
+ j = i0 + 1;
+ if ((j & 0xfffff) == 0)
+ {
+ if (sizeof (long long int) <= 4)
+ /* Overflow. */
+ result = (long long int) x;
+ else
+ result = 1ll << (j0 + 1);
+ }
+ else
+ result = ((long long int) ((i0 & 0xfffff) | 0x100000)
+ << (j0 - 31));
+ }
+ else
+ {
+ result = ((long long int) ((i0 & 0xfffff) | 0x100000)
+ << (j0 - 31));
+ if (sizeof (long long int) > 4 && j0 > 31)
+ result |= j >> (63 - j0);
+ }
+ }
+ else
+ {
+ result = (long long int) ((i0 & 0xfffff) | 0x100000) << (j0 - 31);
+ if (sizeof (long long int) > 4 && j0 > 31)
+ result |= j >> (63 - j0);
+ }
+ }
+
+ return i0 & 0x80000000 ? -result : result;
+}
+#else
+long long int
+__roundtoll (long double x)
+{
+ int32_t j0;
+ u_int32_t se, i1, i0;
+ long long int result;
+
+ GET_LDOUBLE_WORDS (se, i0, i1, x);
+ j0 = (se & 0x7fff) - 0x3fff;
+ if (j0 < 31)
+ {
+ if (j0 < 0)
+ result = j0 < -1 ? 0 : 1;
+ else
+ {
+ u_int32_t i = 0x7fffffff >> j0;
+ if (((i0 & i) | i1) == 0)
+ result = (long long int) i0 >> j0;
+ else
+ {
+ /* X is not integral. */
+ u_int32_t j = i0 + (0x40000000 >> j0);
+ if (j < i0)
+ result = 0x80000000l >> (30 - j0);
+ else
+ result = j >> (31 - j0);
+ }
+ }
+ }
+ else if ((unsigned int) j0 >= 8 * sizeof (long long int) || j0 > 62)
+ {
+ /* The number is too large. It is left implementation defined
+ what happens. */
+ result = (long long int) x;
+ }
+ else
+ {
+ u_int32_t i = ((u_int32_t) (0xffffffff)) >> (j0 - 31);
+ if ((i1 & i) != 0)
+ {
+ /* x is not integral. */
+ u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
+ if (j < i1)
+ {
+ j = i0 + 1;
+ if (j == 0)
+ {
+ if (sizeof (long long int) <= 4)
+ /* Overflow. */
+ result = (long long int) x;
+ else
+ result = 1ll << (j0 + 1);
+ }
+ else
+ result = (long long int) i0 << (j0 - 31);
+ }
+ else
+ {
+ result = (long long int) i0 << (j0 - 31);
+ if (sizeof (long long int) > 4 && j0 > 31)
+ result |= j >> (63 - j0);
+ }
+ }
+ else
+ {
+ result = (long long int) i0 << (j0 - 31);
+ if (sizeof (long long int) > 4 && j0 > 31)
+ result |= i1 >> (63 - j0);
+ }
+ }
+
+ return se & 0x8000 ? -result : result;
+}
+#endif
+weak_alias (__roundtoll, roundtoll)