[51/77] Use opt_scalar_int_mode when iterating over integer modes

This patch uses opt_scalar_int_mode rather than machine_mode
when iterating over scalar_int_modes, in cases where that helps
with future patches.  (Using machine_mode is still OK in places
that don't really care about the mode being a scalar integer.)

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

gcc/
	* cse.c (cse_insn): Use opt_scalar_int_mode for the mode iterator.
	* explow.c (hard_function_value): Likewise.
	* expmed.c (extract_fixed_bit_field_1): Likewise.  Move the
	convert_to_mode call outside the loop.
	* expr.c (alignment_for_piecewise_move): Use opt_scalar_int_mode
	for the mode iterator.  Require the mode specified by max_pieces
	to exist.
	(emit_block_move_via_movmem): Use opt_scalar_int_mode for the
	mode iterator.
	(copy_blkmode_to_reg): Likewise.
	(set_storage_via_setmem): Likewise.
	* optabs.c (prepare_cmp_insn): Likewise.
	* rtlanal.c (init_num_sign_bit_copies_in_rep): Likewise.
	* stor-layout.c (finish_bitfield_representative): Likewise.

gcc/fortran/
	* trans-types.c (gfc_init_kinds): Use opt_scalar_int_mode for
	the mode iterator.

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

From-SVN: r251503

1 files changed, 3 insertions, 6 deletions

diff --git a/gcc/explow.c b/gcc/explow.c
index 72fb682..c5af8ee 100644
--- a/gcc/explow.c
+++ b/gcc/explow.c
@@ -1906,7 +1906,7 @@ hard_function_value (const_tree valtype, const_tree func, const_tree fntype,
       && GET_MODE (val) == BLKmode)
     {
       unsigned HOST_WIDE_INT bytes = int_size_in_bytes (valtype);
-      machine_mode tmpmode;
+      opt_scalar_int_mode tmpmode;
 
       /* int_size_in_bytes can return -1.  We don't need a check here
 	 since the value of bytes will then be large enough that no
@@ -1915,14 +1915,11 @@ hard_function_value (const_tree valtype, const_tree func, const_tree fntype,
       FOR_EACH_MODE_IN_CLASS (tmpmode, MODE_INT)
 	{
 	  /* Have we found a large enough mode?  */
-	  if (GET_MODE_SIZE (tmpmode) >= bytes)
+	  if (GET_MODE_SIZE (tmpmode.require ()) >= bytes)
 	    break;
 	}
 
-      /* No suitable mode found.  */
-      gcc_assert (tmpmode != VOIDmode);
-
-      PUT_MODE (val, tmpmode);
+      PUT_MODE (val, tmpmode.require ());
     }
   return val;
 }