Add random numbers and fix some bugs.

This patch adds random number support for UNSIGNED, plus fixes
two bugs, with array I/O where the type used to be set to BT_INTEGER,
and for division with the divisor being a constant.

gcc/fortran/ChangeLog:

	* check.cc (gfc_check_random_number): Adjust for unsigned.
	* iresolve.cc (gfc_resolve_random_number): Handle unsigned.
	* trans-expr.cc (gfc_conv_expr_op): Handle BT_UNSIGNED for divide.
	* trans-types.cc (gfc_get_dtype_rank_type): Handle BT_UNSIGNED.
	* gfortran.texi: Add RANDOM_NUMBER for UNSIGNED.

libgfortran/ChangeLog:

	* gfortran.map: Add _gfortran_random_m1, _gfortran_random_m2,
	_gfortran_random_m4, _gfortran_random_m8 and _gfortran_random_m16.
	* intrinsics/random.c (random_m1): New function.
	(random_m2): New function.
	(random_m4): New function.
	(random_m8): New function.
	(random_m16): New function.
	(arandom_m1): New function.
	(arandom_m2): New function.
	(arandom_m4): New function.
	(arandom_m8): New funciton.
	(arandom_m16): New function.

gcc/testsuite/ChangeLog:

	* gfortran.dg/unsigned_30.f90: New test.

5 files changed, 21 insertions, 7 deletions

diff --git a/gcc/fortran/check.cc b/gcc/fortran/check.cc
index 533c9d7..1851cfb 100644
--- a/gcc/fortran/check.cc
+++ b/gcc/fortran/check.cc
@@ -7007,8 +7007,14 @@ gfc_check_random_init (gfc_expr *repeatable, gfc_expr *image_distinct)
 bool
 gfc_check_random_number (gfc_expr *harvest)
 {
-  if (!type_check (harvest, 0, BT_REAL))
-    return false;
+  if (flag_unsigned)
+    {
+      if (!type_check2 (harvest, 0, BT_REAL, BT_UNSIGNED))
+	return false;
+    }
+  else
+    if (!type_check (harvest, 0, BT_REAL))
+      return false;
 
   if (!variable_check (harvest, 0, false))
     return false;
diff --git a/gcc/fortran/gfortran.texi b/gcc/fortran/gfortran.texi
index 3eb8039..a5ebadff 100644
--- a/gcc/fortran/gfortran.texi
+++ b/gcc/fortran/gfortran.texi
@@ -2790,6 +2790,7 @@ As of now, the following intrinsics take unsigned arguments:
 @item @code{TRANSFER}
 @item @code{SUM}, @code{PRODUCT}, @code{MATMUL} and @code{DOT_PRODUCT}
 @item @code{IANY}, @code{IALL} and @code{IPARITY}
+@item @code{RANDOM_NUMBER}.
 @end itemize
 This list will grow in the near future.
 @c ---------------------------------------------------------------------
diff --git a/gcc/fortran/iresolve.cc b/gcc/fortran/iresolve.cc
index b281ab7..5a1e0a6 100644
--- a/gcc/fortran/iresolve.cc
+++ b/gcc/fortran/iresolve.cc
@@ -3452,12 +3452,14 @@ gfc_resolve_random_number (gfc_code *c)
 {
   const char *name;
   int kind;
+  char type;
 
   kind = gfc_type_abi_kind (&c->ext.actual->expr->ts);
+  type = gfc_type_letter (c->ext.actual->expr->ts.type);
   if (c->ext.actual->expr->rank == 0)
-    name = gfc_get_string (PREFIX ("random_r%d"), kind);
+    name = gfc_get_string (PREFIX ("random_%c%d"), type, kind);
   else
-    name = gfc_get_string (PREFIX ("arandom_r%d"), kind);
+    name = gfc_get_string (PREFIX ("arandom_%c%d"), type, kind);
 
   c->resolved_sym = gfc_get_intrinsic_sub_symbol (name);
 }
diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index d0c7dfe..e4c491a 100644
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -3973,9 +3973,9 @@ gfc_conv_expr_op (gfc_se * se, gfc_expr * expr)
 
     case INTRINSIC_DIVIDE:
       /* If expr is a real or complex expr, use an RDIV_EXPR. If op1 is
-         an integer, we must round towards zero, so we use a
+	 an integer or unsigned, we must round towards zero, so we use a
          TRUNC_DIV_EXPR.  */
-      if (expr->ts.type == BT_INTEGER)
+      if (expr->ts.type == BT_INTEGER || expr->ts.type == BT_UNSIGNED)
 	code = TRUNC_DIV_EXPR;
       else
 	code = RDIV_EXPR;
diff --git a/gcc/fortran/trans-types.cc b/gcc/fortran/trans-types.cc
index 96ef8b4..05e64b3 100644
--- a/gcc/fortran/trans-types.cc
+++ b/gcc/fortran/trans-types.cc
@@ -1651,7 +1651,12 @@ gfc_get_dtype_rank_type (int rank, tree etype)
 	  && TYPE_STRING_FLAG (ptype))
 	n = BT_CHARACTER;
       else
-	n = BT_INTEGER;
+	{
+	  if (TYPE_UNSIGNED (etype))
+	    n = BT_UNSIGNED;
+	  else
+	    n = BT_INTEGER;
+	}
       break;
 
     case BOOLEAN_TYPE: