[committed][vect] Only change base alignment if more restrictive

[Andre Vieira (lists)]

Hi all,

This patch was pre-approved by richi.  This patch makes sure 
ensure_base_align only changes alignment if the new alignment is more 
restrictive.  It already did this if we were dealing with symbols, but 
it now does it for all types of declarations.

Committed in revision r277238.

Cheers,
Andre

2019-10-21  Andre Vieira  <andre.simoesdiasvie...@arm.com>

        * tree-vect-stmts (ensure_base_align): Only change alignment if new
        alignment is more restrictive.
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index e606945d536ad3353b2317aed5b504a89eec9fc3..a3f99eecdf0976147ddd48725d62b9f18aea08cd 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -6288,7 +6288,7 @@ ensure_base_align (dr_vec_info *dr_info)
 
       if (decl_in_symtab_p (base_decl))
 	symtab_node::get (base_decl)->increase_alignment (align_base_to);
-      else
+      else if (DECL_ALIGN (base_decl) < align_base_to)
 	{
 	  SET_DECL_ALIGN (base_decl, align_base_to);
           DECL_USER_ALIGN (base_decl) = 1;