Generate in priority signed types for integer constants.

2010-07-29  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite-clast-to-gimple.c (gcc_type_for_interval): Generate in
	priority signed types.

From-SVN: r164772

gcc/ChangeLog

 2010-09-30  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* graphite-clast-to-gimple.c (gcc_type_for_interval): Generate in
+	priority signed types.
+
+2010-09-30  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* graphite-clast-to-gimple.c (max_signed_precision_type): Remove the call
 	to lang_hooks.types.type_for_size.  Call build_nonstandard_integer_type.
 

gcc/ChangeLog.graphite

 2010-07-29  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* graphite-clast-to-gimple.c (gcc_type_for_interval): Generate in
+	priority signed types.
+
+2010-07-29  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* graphite-clast-to-gimple.c (max_signed_precision_type): Remove the call
 	to lang_hooks.types.type_for_size.  Call build_nonstandard_integer_type.
 

gcc/graphite-clast-to-gimple.c

@@ -459,9 +459,6 @@ gcc_type_for_interval (mpz_t low, mpz_t up)
 
   gcc_assert (mpz_cmp (low, up) <= 0);
 
-  if (mpz_sgn (low) < 0)
-    unsigned_p = false;
-
   prec_up = precision_for_value (up);
   prec_int = precision_for_interval (low, up);
   precision = MAX (prec_up, prec_int);
@@ -472,6 +469,15 @@ gcc_type_for_interval (mpz_t low, mpz_t up)
       return integer_type_node;
     }
 
+  if (mpz_sgn (low) <= 0)
+    unsigned_p = false;
+
+  else if (precision < BITS_PER_WORD)
+    {
+      unsigned_p = false;
+      precision++;
+    }
+
   mode = smallest_mode_for_size (precision, MODE_INT);
   precision = GET_MODE_PRECISION (mode);
   type = build_nonstandard_integer_type (precision, unsigned_p);