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[PATCH,fortran] Add support for IEEE_SUBNORMAL


Fortran 2018 has added IEEE_SUBNORMAL, IEEE_POSITIVE_SUBNORMAL, and
IEEE_NEGATIVE_SUBNORMAL as counterparts the same features with the
DENORMAL name.  The attached patch allows gfortran to recognize
and do the right thing with these featuers.  OK to commit?

2018-12-25  Steven G. Kargl  <kargl@gcc.gnu.org>

	* expr.c (external_spec_function): Add ieee_support_subnormal to list
	of IEEE inquiry functions.


2018-12-25  Steven G. Kargl  <kargl@gcc.gnu.org>
	* gfortran.map: Expose subnormal functions in dynamic
	library.
	* ieee/ieee_arithmetic.F90: Add support for IEEE_SUBNORMAL,
	IEEE_POSITIVE_SUBNORMAL, and IEEE_NEGATIVE_SUBNORMAL.
	* ieee/ieee_helper.c: Ditto.
	* ieee/ieee_features.F90:  Add IEEE_SUBNORMAL.

-- 
Steve
Index: gcc/fortran/expr.c
===================================================================
--- gcc/fortran/expr.c	(revision 267418)
+++ gcc/fortran/expr.c	(working copy)
@@ -3061,6 +3061,7 @@ external_spec_function (gfc_expr *e)
 	  || !strcmp (f->name, "ieee_support_halting")
 	  || !strcmp (f->name, "ieee_support_datatype")
 	  || !strcmp (f->name, "ieee_support_denormal")
+	  || !strcmp (f->name, "ieee_support_subnormal")
 	  || !strcmp (f->name, "ieee_support_divide")
 	  || !strcmp (f->name, "ieee_support_inf")
 	  || !strcmp (f->name, "ieee_support_io")
Index: libgfortran/gfortran.map
===================================================================
--- libgfortran/gfortran.map	(revision 267418)
+++ libgfortran/gfortran.map	(working copy)
@@ -1573,4 +1573,9 @@ GFORTRAN_9 {
   _gfortran_sfindloc2_s1;
   _gfortran_sfindloc2_s4;
   _gfortran_st_wait_async;
+  __ieee_arithmetic_MOD_ieee_support_subnormal_10;
+  __ieee_arithmetic_MOD_ieee_support_subnormal_16;
+  __ieee_arithmetic_MOD_ieee_support_subnormal_4;
+  __ieee_arithmetic_MOD_ieee_support_subnormal_8;
+  __ieee_arithmetic_MOD_ieee_support_subnormal_noarg;
 };
Index: libgfortran/ieee/ieee_arithmetic.F90
===================================================================
--- libgfortran/ieee/ieee_arithmetic.F90	(revision 267418)
+++ libgfortran/ieee/ieee_arithmetic.F90	(working copy)
@@ -55,9 +55,11 @@ module IEEE_ARITHMETIC
     IEEE_NEGATIVE_INF      = IEEE_CLASS_TYPE(3), &
     IEEE_NEGATIVE_NORMAL   = IEEE_CLASS_TYPE(4), &
     IEEE_NEGATIVE_DENORMAL = IEEE_CLASS_TYPE(5), &
+    IEEE_NEGATIVE_SUBNORMAL= IEEE_CLASS_TYPE(5), &
     IEEE_NEGATIVE_ZERO     = IEEE_CLASS_TYPE(6), &
     IEEE_POSITIVE_ZERO     = IEEE_CLASS_TYPE(7), &
     IEEE_POSITIVE_DENORMAL = IEEE_CLASS_TYPE(8), &
+    IEEE_POSITIVE_SUBNORMAL= IEEE_CLASS_TYPE(8), &
     IEEE_POSITIVE_NORMAL   = IEEE_CLASS_TYPE(9), &
     IEEE_POSITIVE_INF      = IEEE_CLASS_TYPE(10)
 
@@ -795,6 +797,7 @@ REM_MACRO(4,4,4)
 
 SUPPORTGENERIC(IEEE_SUPPORT_DATATYPE)
 SUPPORTGENERIC(IEEE_SUPPORT_DENORMAL)
+SUPPORTGENERIC(IEEE_SUPPORT_SUBNORMAL)
 SUPPORTGENERIC(IEEE_SUPPORT_DIVIDE)
 SUPPORTGENERIC(IEEE_SUPPORT_INF)
 SUPPORTGENERIC(IEEE_SUPPORT_IO)
@@ -1243,7 +1362,7 @@ SUPPORTMACRO(IEEE_SUPPORT_DATATYPE,16,.true.)
 #endif
 SUPPORTMACRO_NOARG(IEEE_SUPPORT_DATATYPE,.true.)
 
-! IEEE_SUPPORT_DENORMAL
+! IEEE_SUPPORT_DENORMAL and IEEE_SUPPORT_SUBNORMAL
 
 SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,4,.true.)
 SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,8,.true.)
@@ -1254,6 +1373,16 @@ SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,10,.true.)
 SUPPORTMACRO(IEEE_SUPPORT_DENORMAL,16,.true.)
 #endif
 SUPPORTMACRO_NOARG(IEEE_SUPPORT_DENORMAL,.true.)
+
+SUPPORTMACRO(IEEE_SUPPORT_SUBNORMAL,4,.true.)
+SUPPORTMACRO(IEEE_SUPPORT_SUBNORMAL,8,.true.)
+#ifdef HAVE_GFC_REAL_10
+SUPPORTMACRO(IEEE_SUPPORT_SUBNORMAL,10,.true.)
+#endif
+#ifdef HAVE_GFC_REAL_16
+SUPPORTMACRO(IEEE_SUPPORT_SUBNORMAL,16,.true.)
+#endif
+SUPPORTMACRO_NOARG(IEEE_SUPPORT_SUBNORMAL,.true.)
 
 ! IEEE_SUPPORT_DIVIDE
 
Index: libgfortran/ieee/ieee_features.F90
===================================================================
--- libgfortran/ieee/ieee_features.F90	(revision 267418)
+++ libgfortran/ieee/ieee_features.F90	(working copy)
@@ -36,6 +36,7 @@ module IEEE_FEATURES
   type(IEEE_FEATURES_TYPE), parameter, public :: &
     IEEE_DATATYPE       = IEEE_FEATURES_TYPE(0), &
     IEEE_DENORMAL       = IEEE_FEATURES_TYPE(1), &
+    IEEE_SUBNORMAL      = IEEE_FEATURES_TYPE(1), &
     IEEE_DIVIDE         = IEEE_FEATURES_TYPE(2), &
     IEEE_HALTING        = IEEE_FEATURES_TYPE(3), &
     IEEE_INEXACT_FLAG   = IEEE_FEATURES_TYPE(4), &
Index: libgfortran/ieee/ieee_helper.c
===================================================================
--- libgfortran/ieee/ieee_helper.c	(revision 267418)
+++ libgfortran/ieee/ieee_helper.c	(working copy)
@@ -50,7 +50,8 @@ internal_proto(ieee_class_helper_16);
 enum { IEEE_OTHER_VALUE = 0, IEEE_SIGNALING_NAN, IEEE_QUIET_NAN,
   IEEE_NEGATIVE_INF, IEEE_NEGATIVE_NORMAL, IEEE_NEGATIVE_DENORMAL,
   IEEE_NEGATIVE_ZERO, IEEE_POSITIVE_ZERO, IEEE_POSITIVE_DENORMAL,
-  IEEE_POSITIVE_NORMAL, IEEE_POSITIVE_INF };
+  IEEE_POSITIVE_NORMAL, IEEE_POSITIVE_INF, IEEE_SUBNORMAL,
+  IEEE_NEGATIVE_SUBNORMAL, IEEE_POSITIVE_SUBNORMAL };
 
 #define CLASSMACRO(TYPE) \
   int ieee_class_helper_ ## TYPE (GFC_REAL_ ## TYPE *value) \

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