Add missing long double functions to Cygwin

This patch adds the long double functions missing in newlib to Cygwin.
Apart from some self-written additions (exp10l, finite{f,l}, isinf{f,l},
isnan{f,l}, pow10l) the files are taken from the Mingw-w64 math lib.
Minor changes were required, e.g. substitue _WIN64 with __x86_64__ and
fixing __FLT_RPT_DOMAIN/__FLT_RPT_ERANGE for Cygwin.

Cygwin:
	* math: New subdir with math functions.
	* Makefile.in (VPATH): Add math subdir.
	(MATH_OFILES): List of object files collected from building files in
	math subdir.
	(DLL_OFILES): Add $(MATH_OFILES).
	${CURDIR}/libm.a: Add $(MATH_OFILES) to build.
	* common.din: Add new functions from math subdir.
	* i686.din: Align to new math subdir.  Remove functions now commonly
	available.
	* x86_64.din: Ditto.
	* math.h: math.h wrapper to define mingw structs used in some files in
	math subdir.
	* include/cygwin/version.h: Bump API minor version.

newlib:
	* libc/include/complex.h: Add prototypes for complex long double
	functions.  Only define for Cygwin.
	* libc/include/math.h: Additionally enable prototypes of long double
	functions for Cygwin.  Add Cygwin-only prototypes for dreml, sincosl,
	exp10l and pow10l.  Explain why we don't add them to newlib.
	* libc/include/tgmath.h: Enable long double handling on Cygwin.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

1 files changed, 92 insertions, 0 deletions

diff --git a/winsup/cygwin/math/tanhl.c b/winsup/cygwin/math/tanhl.c
new file mode 100644
index 000000000..2c48a6aab
--- /dev/null
+++ b/winsup/cygwin/math/tanhl.c
@@ -0,0 +1,92 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+#include "cephes_mconf.h"
+#ifndef _SET_ERRNO
+#define _SET_ERRNO(x)
+#endif
+
+#ifdef UNK
+static uLD P[] = {
+  { { -6.8473739392677100872869E-5L } },
+  { { -9.5658283111794641589011E-1L } },
+  { { -8.4053568599672284488465E1L } },
+  { { -1.3080425704712825945553E3L } }
+};
+static uLD Q[] = {
+  { { 9.6259501838840336946872E1L } },
+  { { 1.8218117903645559060232E3L } },
+  { { 3.9241277114138477845780E3L } }
+};
+#endif
+
+#ifdef IBMPC
+static uLD P[] = {
+  { { 0xd2a4,0x1b0c,0x8f15,0x8f99,0xbff1, 0, 0, 0 } },
+  { { 0x5959,0x9111,0x9cc7,0xf4e2,0xbffe, 0, 0, 0 } },
+  { { 0xb576,0xef5e,0x6d57,0xa81b,0xc005, 0, 0, 0 } },
+  { { 0xe3be,0xbfbd,0x5cbc,0xa381,0xc009, 0, 0, 0 } }
+};
+static uLD Q[] = {
+  { { 0x687f,0xce24,0xdd6c,0xc084,0x4005, 0, 0, 0 } },
+  { { 0x3793,0xc95f,0xfa2f,0xe3b9,0x4009, 0, 0, 0 } },
+  { { 0xd5a2,0x1f9c,0x0b1b,0xf542,0x400a, 0, 0, 0 } }
+};
+#endif
+
+#ifdef MIEEE
+static uLD P[] = {
+  { { 0xbff10000,0x8f998f15,0x1b0cd2a4, 0 } },
+  { { 0xbffe0000,0xf4e29cc7,0x91115959, 0 } },
+  { { 0xc0050000,0xa81b6d57,0xef5eb576, 0 } },
+  { { 0xc0090000,0xa3815cbc,0xbfbde3be, 0 } }
+};
+static uLD Q[] = {
+  { { 0x40050000,0xc084dd6c,0xce24687f, 0 } },
+  { { 0x40090000,0xe3b9fa2f,0xc95f3793, 0 } },
+  { { 0x400a0000,0xf5420b1b,0x1f9cd5a2, 0 } }
+};
+#endif
+
+long double tanhl(long double x)
+{
+  long double s, z;
+
+#ifdef MINUSZERO
+  if (x == 0.0L)
+    return (x);
+#endif
+  if (isnanl(x))
+  {
+    _SET_ERRNO (EDOM);
+    return x;
+  }
+
+  z = fabsl(x);
+  if (z > 0.5L * MAXLOGL)
+  {
+    _SET_ERRNO (ERANGE);
+    if (x > 0)
+      return (1.0L);
+    else
+      return (-1.0L);
+  }
+  if (z >= 0.625L)
+  {
+    s = expl(2.0*z);
+    z =  1.0L  - 2.0/(s + 1.0L);
+    if (x < 0)
+      z = -z;
+  }
+  else
+  {
+    s = x * x;
+    z = polevll( s, P, 3 )/p1evll(s, Q, 3);
+    z = x * s * z;
+    z = x + z;
+  }
+  return (z);
+}
+