x86 long double: Support pseudo numbers in fpclassifyl

Also move sysdeps/i386/fpu/s_fpclassifyl.c to
sysdeps/x86/fpu/s_fpclassifyl.c and remove
sysdeps/x86_64/fpu/s_fpclassifyl.c

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/sysdeps/x86/fpu/s_fpclassifyl.c b/sysdeps/x86/fpu/s_fpclassifyl.c
new file mode 100644
index 0000000000..a48b7685c4
--- /dev/null
+++ b/sysdeps/x86/fpu/s_fpclassifyl.c
@@ -0,0 +1,46 @@
+/* Return classification value corresponding to argument.
+   Copyright (C) 1997-2020 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 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, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+
+#include <math_private.h>
+
+
+int
+__fpclassifyl (long double x)
+{
+  uint32_t ex, hx, lx;
+  int retval = FP_NORMAL;
+
+  GET_LDOUBLE_WORDS (ex, hx, lx, x);
+  ex &= 0x7fff;
+  if ((ex | lx | hx) == 0)
+    retval = FP_ZERO;
+  else if (ex == 0 && (hx & 0x80000000) == 0)
+    retval = FP_SUBNORMAL;
+  /* Pseudo-normals, i.e. pseudo-zero, pseudo-infinity and un-normals.  They
+     behave like NaNs, so categorize them as such.  */
+  else if ((hx & 0x80000000) == 0)
+    retval = FP_NAN;
+  else if (ex == 0x7fff)
+    retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
+
+  return retval;
+}
+libm_hidden_def (__fpclassifyl)