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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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diff --git a/sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c b/sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c
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+/* Return classification value corresponding to argument.
+ Copyright (C) 1997,1999,2002,2004,2006,2007 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
+ Jakub Jelinek <jj@ultra.linux.cz>, 1999.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; 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"
+#include <math_ldbl_opt.h>
+
+ /*
+ * hx lx
+ * +NaN 7ffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
+ * -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
+ * +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
+ * -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
+ * +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
+ * -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
+ * +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
+ * -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
+ * +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
+ * +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
+ * +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
+ * -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
+ * +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
+ * -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
+ */
+
+int
+___fpclassifyl (long double x)
+{
+ u_int64_t hx, lx;
+ int retval = FP_NORMAL;
+
+ GET_LDOUBLE_WORDS64 (hx, lx, x);
+ if ((hx & 0x7ff0000000000000ULL) == 0x7ff0000000000000ULL) {
+ /* +/-NaN or +/-Inf */
+ if (hx & 0x000fffffffffffffULL) {
+ /* +/-NaN */
+ retval = FP_NAN;
+ } else {
+ retval = FP_INFINITE;
+ }
+ } else {
+ /* +/-zero or +/- normal or +/- denormal */
+ if (hx & 0x7fffffffffffffffULL) {
+ /* +/- normal or +/- denormal */
+ if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
+ /* +/- normal */
+ retval = FP_NORMAL;
+ } else {
+ if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
+ if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
+ && ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
+ /* +/- denormal */
+ retval = FP_SUBNORMAL;
+ } else {
+ /* +/- normal */
+ retval = FP_NORMAL;
+ }
+ } else {
+ /* +/- denormal */
+ retval = FP_SUBNORMAL;
+ }
+ }
+ } else {
+ /* +/- zero */
+ retval = FP_ZERO;
+ }
+ }
+
+ return retval;
+}
+long_double_symbol (libm, ___fpclassifyl, __fpclassifyl);
+#ifdef __LONG_DOUBLE_MATH_OPTIONAL
+libm_hidden_ver (___fpclassifyl, __fpclassifyl)
+#else
+libm_hidden_def (__fpclassifyl)
+#endif