[76/77] Add a scalar_mode_pod class

This patch adds a scalar_mode_pod class and uses it to
replace the machine_mode in fixed_value.

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

gcc/
	* coretypes.h (scalar_mode_pod): New typedef.
	* gdbhooks.py (build_pretty_printer): Handle it.
	* machmode.h (gt_ggc_mx, gt_pch_nx): New functions.
	* fixed-value.h (fixed_value::mode): Change type to scalar_mode_pod.
	* fold-const.c (fold_convert_const_int_from_fixed): Use scalar_mode.
	* tree-streamer-in.c (unpack_ts_fixed_cst_value_fields): Use
	as_a <scalar_mode>.

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

From-SVN: r251526

gcc/ChangeLog

@@ -2,6 +2,18 @@
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
 
+	* coretypes.h (scalar_mode_pod): New typedef.
+	* gdbhooks.py (build_pretty_printer): Handle it.
+	* machmode.h (gt_ggc_mx, gt_pch_nx): New functions.
+	* fixed-value.h (fixed_value::mode): Change type to scalar_mode_pod.
+	* fold-const.c (fold_convert_const_int_from_fixed): Use scalar_mode.
+	* tree-streamer-in.c (unpack_ts_fixed_cst_value_fields): Use
+	as_a <scalar_mode>.
+
+2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
 	* machmode.h (mode_for_vector): Take a scalar_mode instead
 	of a machine_mode.
 	* stor-layout.c (mode_for_vector): Likewise.

gcc/coretypes.h

@@ -63,6 +63,7 @@ typedef opt_mode<scalar_mode> opt_scalar_mode;
 typedef opt_mode<scalar_int_mode> opt_scalar_int_mode;
 typedef opt_mode<scalar_float_mode> opt_scalar_float_mode;
 template<typename> class pod_mode;
+typedef pod_mode<scalar_mode> scalar_mode_pod;
 typedef pod_mode<scalar_int_mode> scalar_int_mode_pod;
 
 /* Subclasses of rtx_def, using indentation to show the class

gcc/fixed-value.h

@@ -23,7 +23,7 @@ along with GCC; see the file COPYING3.  If not see
 struct GTY(()) fixed_value
 {
   double_int data;       /* Store data up to 2 wide integers.  */
-  machine_mode mode;	/* Use machine mode to know IBIT and FBIT.  */
+  scalar_mode_pod mode;  /* Use machine mode to know IBIT and FBIT.  */
 };
 
 #define FIXED_VALUE_TYPE struct fixed_value

gcc/fold-const.c

@@ -1944,7 +1944,7 @@ fold_convert_const_int_from_fixed (tree type, const_tree arg1)
 {
   tree t;
   double_int temp, temp_trunc;
-  machine_mode mode;
+  scalar_mode mode;
 
   /* Right shift FIXED_CST to temp by fbit.  */
   temp = TREE_FIXED_CST (arg1).data;

gcc/gdbhooks.py

@@ -548,7 +548,8 @@ def build_pretty_printer():
                              'opt_mode', OptMachineModePrinter)
     pp.add_printer_for_regex(r'pod_mode<(\S+)>',
                              'pod_mode', MachineModePrinter)
-    pp.add_printer_for_types(['scalar_int_mode_pod'],
+    pp.add_printer_for_types(['scalar_int_mode_pod',
+                              'scalar_mode_pod'],
                              'pod_mode', MachineModePrinter)
     for mode in 'scalar_mode', 'scalar_int_mode', 'scalar_float_mode':
         pp.add_printer_for_types([mode], mode, MachineModePrinter)

gcc/machmode.h

@@ -893,4 +893,22 @@ namespace mode_iterator
        mode_iterator::iterate_p (&(ITERATOR)); \
        mode_iterator::get_2xwider (&(ITERATOR)))
 
+template<typename T>
+void
+gt_ggc_mx (pod_mode<T> *)
+{
+}
+
+template<typename T>
+void
+gt_pch_nx (pod_mode<T> *)
+{
+}
+
+template<typename T>
+void
+gt_pch_nx (pod_mode<T> *, void (*) (void *, void *), void *)
+{
+}
+
 #endif /* not HAVE_MACHINE_MODES */

gcc/tree-streamer-in.c

@@ -211,7 +211,7 @@ static void
 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 {
   FIXED_VALUE_TYPE *fp = ggc_alloc<fixed_value> ();
-  fp->mode = bp_unpack_machine_mode (bp);
+  fp->mode = as_a <scalar_mode> (bp_unpack_machine_mode (bp));
   fp->data.low = bp_unpack_var_len_int (bp);
   fp->data.high = bp_unpack_var_len_int (bp);
   TREE_FIXED_CST_PTR (expr) = fp;