Add incomplet long double math support to libmingwex.a

winsup/mingw/mingwex/math/fp_consts.h

@@ -0,0 +1,48 @@
+#ifndef _FP_CONSTS_H
+#define _FP_CONSTS_H
+
+/*
+According to IEEE 754 a QNaN has exponent bits of all 1 values and
+initial significand bit of 1.  A SNaN has has an exponent of all 1
+values and initial significand bit of 0 (with one or more other
+significand bits of 1). An Inf has significand of 0 and
+exponent of all 1 values. A denormal value has all exponent bits of 0.
+
+The following does _not_ follow those rules, but uses values
+equal to those exported from MS C++ runtime lib, msvcprt.dll
+for float and double. MSVC however, does not have long doubles.
+*/
+
+
+#define __DOUBLE_INF_REP { 0, 0, 0, 0x7ff0 }
+#define __DOUBLE_QNAN_REP { 0, 0, 0, 0xfff8 }  /* { 0, 0, 0, 0x7ff8 }  */
+#define __DOUBLE_SNAN_REP { 0, 0, 0, 0xfff0 }  /* { 1, 0, 0, 0x7ff0 }  */
+#define __DOUBLE_DENORM_REP {1, 0, 0, 0}
+
+#define D_NAN_MASK 0x7ff0000000000000LL /* this will mask NaN's and Inf's */
+
+#define __FLOAT_INF_REP { 0, 0x7f80 }
+#define __FLOAT_QNAN_REP { 0, 0xffc0 }  /* { 0, 0x7fc0 }  */
+#define __FLOAT_SNAN_REP { 0, 0xff80 }  /* { 1, 0x7f80 }  */
+#define __FLOAT_DENORM_REP {1,0}
+
+#define F_NAN_MASK 0x7f800000
+
+/*
+   This assumes no implicit (hidden) bit in extended mode.
+   Padded to 96 bits
+ */
+#define __LONG_DOUBLE_INF_REP { 0, 0, 0, 0x8000, 0x7fff, 0 }
+#define __LONG_DOUBLE_QNAN_REP { 0, 0, 0, 0xc000, 0xffff, 0 } 
+#define __LONG_DOUBLE_SNAN_REP { 0, 0, 0, 0x8000, 0xffff, 0 }
+#define __LONG_DOUBLE_DENORM_REP {1, 0, 0, 0, 0, 0}
+
+union _ieee_rep
+{
+  unsigned short rep[6];
+  float float_val;
+  double double_val;
+  long double ldouble_val;
+} ;
+
+#endif