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 --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 6fea8a6..474d0f4 100644 (file)
--- 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))