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-rw-r--r--sysdeps/libm-ieee754/s_rinttoll.c242
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diff --git a/sysdeps/libm-ieee754/s_rinttoll.c b/sysdeps/libm-ieee754/s_rinttoll.c
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+/* Round argument to nearest integral value according to current rounding
+ direction.
+ 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. */
+static long double two52[2] =
+{
+ 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
+ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
+};
+
+
+long long int
+__rinttoll (long double x)
+{
+ int32_t j0,sx;
+ u_int32_t i0, i1, i;
+ long double t, w;
+ long long int result;
+
+ EXTRACT_WORDS (i0, i1, x);
+
+ sx = i0 >> 31;
+ j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+
+ if (j0 < 20)
+ {
+ if (j0 < 0)
+ {
+ if (((i0 & 0x7fffffff) | i1) == 0)
+ /* The number is 0. */
+ result = 0;
+ else
+ {
+ i1 |= i0;
+ i0 &= 0xfffe0000;
+ i0 |= ((i1 | -i1) >> 12) & 0x80000;
+ SET_HIGH_WORD (x, i0);
+ w = two52[sx] + x;
+ t = w - two52[sx];
+ GET_HIGH_WORD (i0, t);
+ if ((i0 & 0x7fffffff) >= 0x3fff0000)
+ result = sx ? -1 : 1;
+ else
+ result = 0;
+ }
+ }
+ else
+ {
+ u_int32_t i = 0x000fffff >> j0;
+ if (((i0 & i) | i1) == 0)
+ {
+ /* X is not integral. */
+ i >>= 1;
+ if (((i0 & i) | i1) != 0)
+ {
+ if (j0 == 19)
+ i1 = 0x40000000;
+ else
+ i0 = (i0 & (~i)) | (0x20000 >> j0);
+
+ INSERT_WORDS (x, i0, i1);
+ w = two52[sx] + x;
+ x = w - two52[sx];
+ EXTRACT_WORDS (i0, i1, x);
+
+ j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+ }
+ }
+
+ result = ((i0 >> (20 - j0)) & 0xfffff) | (0x00100000 >> (20 - j0));
+ if (sx)
+ result = -result;
+ }
+ }
+ else if ((unsigned int) j0 < sizeof (long long int) * 8 && j0 < 53)
+ {
+ i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
+ if ((i1 & i) != 0)
+ {
+ /* x is not integral. */
+ i >>= 1;
+ if ((i1 & i) != 0)
+ i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 20));
+ }
+
+ INSERT_WORDS (x, i0, i1);
+ w = two52[sx] + x;
+ x = w - two52[sx];
+ EXTRACT_WORDS (i0, i1, x);
+
+ j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
+
+ result = i0 | 0x00100000;
+ if (j0 > 20)
+ {
+ result <<= j0 - 20;
+ result |= i1 >> (52 - j0);
+ }
+ if (sx)
+ result = -result;
+ }
+ else
+ /* Too large. The number is either +-inf or NaN or it is too
+ large to be effected by rounding. The standard leaves it
+ undefined what to return when the number is too large to fit in
+ a `long int'. */
+ result = (long long int) x;
+
+ return result;
+}
+
+#else
+static long double two63[2] =
+{
+ 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */
+ -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */
+};
+
+
+long long int
+__rinttoll (long double x)
+{
+ int32_t se,j0,sx;
+ u_int32_t i0, i1, i;
+ long long int result;
+ long double w, t;
+
+ GET_LDOUBLE_WORDS (se, i0, i1, x);
+
+ sx = (se >> 15) & 1;
+ j0 = (se & 0x7fff) - 0x3fff;
+
+ if (j0 < 31)
+ {
+ if (j0 < 0)
+ {
+ if (((se & 0x7fff) | i0 | i1) == 0)
+ /* The number is 0. */
+ result = 0;
+ else
+ {
+ i1 |= i0;
+ i0 &= 0xe0000000;
+ i0 |= (i1 | -i1) & 0x80000000;
+ SET_LDOUBLE_MSW (x, i0);
+ w = two63[sx] + x;
+ t = w - two63[sx];
+ GET_LDOUBLE_EXP (i0, t);
+ if ((i0 & 0x7fff) >= 0x3fff)
+ result = sx ? -1 : 1;
+ else
+ result = 0;
+ }
+ }
+ else
+ {
+ u_int32_t i = 0x7fffffff >> j0;
+ if (((i0 & i) | i1) == 0)
+ {
+ /* X is not integral. */
+ i >>= 1;
+ if (((i0 & i) | i1) != 0)
+ {
+ if (j0 == 31)
+ i1 = 0x40000000;
+ else
+ i0 = (i0 & (~i)) | (0x20000000 >> j0);
+
+ SET_LDOUBLE_WORDS (x, se, i0, i1);
+ w = two63[sx] + x;
+ x = w - two63[sx];
+ GET_LDOUBLE_WORDS (se, i0, i1, x);
+
+ sx = (se >> 15) & 1;
+ j0 = (se & 0x7fff) - 0x3fff;
+ }
+ }
+
+
+ result = i0 >> (31 - j0);
+ }
+ }
+ else if ((unsigned int) j0 < sizeof (long long int) * 8 && j0 < 64)
+ {
+ i = ((u_int32_t) (0xffffffff)) >> (j0 - 31);
+ if ((i1 & i) != 0)
+ {
+ /* x is not integral. */
+ i >>= 1;
+ if ((i1 & i) != 0)
+ i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 31));
+ }
+
+ SET_LDOUBLE_WORDS (x, se, i0, i1);
+ w = two63[sx] + x;
+ x = w - two63[sx];
+ GET_LDOUBLE_WORDS (se, i0, i1, x);
+
+ j0 = (se & 0x7fff) - 0x3fff;
+
+ result = i0;
+ if (j0 > 31)
+ {
+ result <<= j0 - 31;
+ result |= i1 >> (63 - j0);
+ }
+ }
+ else
+ /* Too large. The number is either +-inf or NaN or it is too
+ large to be effected by rounding. The standard leaves it
+ undefined what to return when the number is too large to fit in
+ a `long int'. */
+ result = (long long int) x;
+
+ return result;
+}
+#endif
+
+weak_alias (__rinttoll, rinttoll)