> Ah, get_object_alignment used keep_aligning ... Yes, the patch contains the rather explicit hunks:
Index: gcc/builtins.c =================================================================== --- gcc/builtins.c (revision 204101) +++ gcc/builtins.c (working copy) @@ -315,7 +315,7 @@ get_object_alignment_2 (tree exp, unsigned int *al /* Get the innermost object and the constant (bitpos) and possibly variable (offset) offset of the access. */ exp = get_inner_reference (exp, &bitsize, &bitpos, &offset, - &mode, &unsignedp, &volatilep, true); + &mode, &unsignedp, &volatilep); /* Extract alignment information from the innermost object and possibly adjust bitpos and offset. */ @@ -346,10 +346,6 @@ get_object_alignment_2 (tree exp, unsigned int *al align = DECL_ALIGN (exp); known_alignment = true; } - else if (TREE_CODE (exp) == VIEW_CONVERT_EXPR) - { - align = TYPE_ALIGN (TREE_TYPE (exp)); - } else if (TREE_CODE (exp) == INDIRECT_REF || TREE_CODE (exp) == MEM_REF || TREE_CODE (exp) == TARGET_MEM_REF) -- Eric Botcazou