[gcc r12-3899] middle-end/102450 - avoid type_for_size for non-existing modes

[Richard Biener]

https://gcc.gnu.org/g:d06dc8a2c73735e9496f434787ba4c93ceee5eea

commit r12-3899-gd06dc8a2c73735e9496f434787ba4c93ceee5eea
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Sep 27 13:36:12 2021 +0200

    middle-end/102450 - avoid type_for_size for non-existing modes
    
    This avoids asking type_for_size for types with sizes for which
    no scalar integer mode exists.  Instead the following uses
    int_mode_for_size to get the same result.
    
    2021-09-27  Richard Biener  <rguenther@suse.de>
    
            PR middle-end/102450
            * gimple-fold.c (gimple_fold_builtin_memory_op): Avoid using
            type_for_size, instead use int_mode_for_size.

Diff:
---
 gcc/gimple-fold.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 6fea8a6f9fd..474d0f44375 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -1001,9 +1001,7 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
 		  return false;
 
 	      scalar_int_mode mode;
-	      tree type = lang_hooks.types.type_for_size (ilen * 8, 1);
-	      if (type
-		  && is_a <scalar_int_mode> (TYPE_MODE (type), &mode)
+	      if (int_mode_for_size (ilen * 8, 0).exists (&mode)
 		  && GET_MODE_SIZE (mode) * BITS_PER_UNIT == ilen * 8
 		  && have_insn_for (SET, mode)
 		  /* If the destination pointer is not aligned we must be able
@@ -1013,6 +1011,7 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
 		      || (optab_handler (movmisalign_optab, mode)
 			  != CODE_FOR_nothing)))
 		{
+		  tree type = build_nonstandard_integer_type (ilen * 8, 1);
 		  tree srctype = type;
 		  tree desttype = type;
 		  if (src_align < GET_MODE_ALIGNMENT (mode))