[18/77] Make int_mode_for_mode return an opt_scalar_int_mode

Also use int_mode_for_mode instead of (int_)mode_for_size
in cases where the requested size was the bitsize of an
existing 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 (opt_mode::else_blk): New function.
	(int_mode_for_mode): Declare.
	* stor-layout.c (int_mode_for_mode): Return an opt_scalar_int_mode.
	* builtins.c (expand_builtin_signbit): Adjust for new int_mode_for_mode
	return type.
	* cfgexpand.c (expand_debug_expr): Likewise.
	* combine.c (gen_lowpart_or_truncate): Likewise.
	(gen_lowpart_for_combine): Likewise.
	* config/aarch64/aarch64.c (aarch64_emit_approx_sqrt): Likewise.
	* config/avr/avr.c (avr_to_int_mode): Likewise.
	(avr_out_plus_1): Likewise.
	(avr_out_plus): Likewise.
	(avr_out_round): Likewise.
	* config/i386/i386.c (ix86_split_to_parts): Likewise.
	* config/s390/s390.c (s390_expand_vec_compare_cc): Likewise.
	(s390_expand_vcond): Likewise.
	* config/spu/spu.c (spu_split_immediate): Likewise.
	(spu_expand_mov): Likewise.
	* dse.c (get_stored_val): Likewise.
	* expmed.c (store_bit_field_1): Likewise.
	(convert_extracted_bit_field): Use int_mode_for_mode instead of
	int_mode_for_size.
	(extract_bit_field_1): Adjust for new int_mode_for_mode return type.
	(extract_low_bits): Likewise.
	* expr.c (emit_group_load_1): Likewise.  Separate out the BLKmode
	handling rather than repeating the check.
	(emit_group_store): Likewise.
	(emit_move_via_integer): Adjust for new int_mode_for_mode return type.
	* optabs.c (expand_absneg_bit): Likewise.
	(expand_copysign_absneg): Likewise.
	(expand_copysign_bit): Likewise.
	* tree-if-conv.c (ifcvt_can_use_mask_load_store): Likewise.
	* tree-vect-slp.c (vect_transform_slp_perm_load): Likewise.
	* tree-vect-stmts.c (vect_gen_perm_mask_any): Likewise.
	* var-tracking.c (prepare_call_arguments):  Likewise.
	* config/powerpcspe/powerpcspe.c (rs6000_do_expand_vec_perm): Use
	int_mode_for_mode instead of mode_for_size.
	* config/rs6000/rs6000.c (rs6000_do_expand_vec_perm): Likewise.

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

From-SVN: r251470

1 files changed, 3 insertions, 5 deletions

diff --git a/gcc/config/spu/spu.c b/gcc/config/spu/spu.c
index 7216937..dfa777e 100644
--- a/gcc/config/spu/spu.c
+++ b/gcc/config/spu/spu.c
@@ -1493,10 +1493,9 @@ spu_split_immediate (rtx * ops)
 	unsigned char arrlo[16];
 	rtx to, temp, hi, lo;
 	int i;
-	machine_mode imode = mode;
 	/* We need to do reals as ints because the constant used in the
 	   IOR might not be a legitimate real constant. */
-	imode = int_mode_for_mode (mode);
+	scalar_int_mode imode = int_mode_for_mode (mode).require ();
 	constant_to_array (mode, ops[1], arrhi);
 	if (imode != mode)
 	  to = simplify_gen_subreg (imode, ops[0], mode, 0);
@@ -1522,10 +1521,9 @@ spu_split_immediate (rtx * ops)
 	unsigned char arr_andbi[16];
 	rtx to, reg_fsmbi, reg_and;
 	int i;
-	machine_mode imode = mode;
 	/* We need to do reals as ints because the constant used in the
 	 * AND might not be a legitimate real constant. */
-	imode = int_mode_for_mode (mode);
+	scalar_int_mode imode = int_mode_for_mode (mode).require ();
 	constant_to_array (mode, ops[1], arr_fsmbi);
 	if (imode != mode)
 	  to = simplify_gen_subreg(imode, ops[0], GET_MODE (ops[0]), 0);
@@ -4430,7 +4428,7 @@ spu_expand_mov (rtx * ops, machine_mode mode)
   if (GET_CODE (ops[1]) == SUBREG && !valid_subreg (ops[1]))
     {
       rtx from = SUBREG_REG (ops[1]);
-      machine_mode imode = int_mode_for_mode (GET_MODE (from));
+      scalar_int_mode imode = int_mode_for_mode (GET_MODE (from)).require ();
 
       gcc_assert (GET_MODE_CLASS (mode) == MODE_INT
 		  && GET_MODE_CLASS (imode) == MODE_INT