[33/77] Add a NARROWEST_INT_MODE macro

This patch replaces uses of GET_CLASS_NARROWEST_MODE (MODE_INT) with a
new NARROWEST_INT_MODE macro, which has type scalar_int_mode.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* machmode.h (NARROWEST_INT_MODE): New macro.
	* expr.c (alignment_for_piecewise_move): Use it instead of
	GET_CLASS_NARROWEST_MODE (MODE_INT).
	(push_block): Likewise.
	* stor-layout.c (bit_field_mode_iterator::bit_field_mode_iterator):
	Likewise.
	* tree-vrp.c (simplify_float_conversion_using_ranges): Likewise.

gcc/ada/
	* gcc-interface/decl.c (validate_size): Use NARROWEST_INT_MODE
	instead of GET_CLASS_NARROWEST_MODE (MODE_INT).

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r251485

gcc/ChangeLog

@@ -2,6 +2,18 @@
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
 
+	* machmode.h (NARROWEST_INT_MODE): New macro.
+	* expr.c (alignment_for_piecewise_move): Use it instead of
+	GET_CLASS_NARROWEST_MODE (MODE_INT).
+	(push_block): Likewise.
+	* stor-layout.c (bit_field_mode_iterator::bit_field_mode_iterator):
+	Likewise.
+	* tree-vrp.c (simplify_float_conversion_using_ranges): Likewise.
+
+2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
 	* expr.c (expand_expr_real_2): Use scalar_int_mode for the
 	double-word mode.
 	* lower-subreg.c (resolve_shift_zext): Use is_a <scalar_int_mode>.

gcc/ada/ChangeLog

@@ -2,6 +2,13 @@
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
 
+	* gcc-interface/decl.c (validate_size): Use NARROWEST_INT_MODE
+	instead of GET_CLASS_NARROWEST_MODE (MODE_INT).
+
+2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
 	* gcc-interface/decl.c (check_ok_for_atomic_type): Use
 	is_a <scalar_int_mode>.
 	* gcc-interface/trans.c (Pragma_to_gnu): Likewise.

gcc/ada/gcc-interface/decl.c

@@ -8574,7 +8574,7 @@ validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object,
      by the smallest integral mode that's valid for pointers.  */
   if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type))
     {
-      machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+      scalar_int_mode p_mode = NARROWEST_INT_MODE;
       while (!targetm.valid_pointer_mode (p_mode))
 	p_mode = GET_MODE_WIDER_MODE (p_mode).require ();
       type_size = bitsize_int (GET_MODE_BITSIZE (p_mode));

gcc/expr.c

@@ -707,7 +707,7 @@ alignment_for_piecewise_move (unsigned int max_pieces, unsigned int align)
     {
       machine_mode tmode, xmode;
 
-      xmode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+      xmode = NARROWEST_INT_MODE;
       FOR_EACH_MODE_IN_CLASS (tmode, MODE_INT)
 	{
 	  if (GET_MODE_SIZE (tmode) > max_pieces
@@ -3910,7 +3910,7 @@ push_block (rtx size, int extra, int below)
 			     negate_rtx (Pmode, size));
     }
 
-  return memory_address (GET_CLASS_NARROWEST_MODE (MODE_INT), temp);
+  return memory_address (NARROWEST_INT_MODE, temp);
 }
 
 /* A utility routine that returns the base of an auto-inc memory, or NULL.  */

gcc/machmode.h

@@ -655,6 +655,12 @@ extern const unsigned char class_narrowest_mode[MAX_MODE_CLASS];
 #define GET_CLASS_NARROWEST_MODE(CLASS) \
   ((machine_mode) class_narrowest_mode[CLASS])
 
+/* The narrowest full integer mode available on the target.  */
+
+#define NARROWEST_INT_MODE \
+  (scalar_int_mode \
+   (scalar_int_mode::from_int (class_narrowest_mode[MODE_INT])))
+
 /* Return the narrowest mode in T's class.  */
 
 template<typename T>

gcc/stor-layout.c

@@ -2723,7 +2723,7 @@ bit_field_mode_iterator
 			   HOST_WIDE_INT bitregion_start,
 			   HOST_WIDE_INT bitregion_end,
 			   unsigned int align, bool volatilep)
-: m_mode (GET_CLASS_NARROWEST_MODE (MODE_INT)), m_bitsize (bitsize),
+: m_mode (NARROWEST_INT_MODE), m_bitsize (bitsize),
   m_bitpos (bitpos), m_bitregion_start (bitregion_start),
   m_bitregion_end (bitregion_end), m_align (align),
   m_volatilep (volatilep), m_count (0)

gcc/tree-vrp.c

@@ -10120,7 +10120,7 @@ simplify_float_conversion_using_ranges (gimple_stmt_iterator *gsi,
      integer mode available.  */
   else
     {
-      mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
+      mode = NARROWEST_INT_MODE;
       for (;;)
 	{
 	  /* If we cannot do a signed conversion to float from mode