[PATCH][RFC] Improve get_qualified_type linear list walk
Michael Matz
matz@suse.de
Tue Apr 16 16:14:00 GMT 2019
Hi,
On Tue, 16 Apr 2019, Richard Biener wrote:
> Comments?
I was quickly testing also with some early-outs but didn't get conclusive
performance results (but really only superficial testing) so I'm not
proposing it, like so:
diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c
index 7045284..33f56f9 100644
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -1508,6 +1508,10 @@ same_type_ignoring_top_level_qualifiers_p (tree
if (type1 == error_mark_node || type2 == error_mark_node)
return false;
+ if (type1 == type2)
+ return true;
+ if (TYPE_MAIN_VARIANT (type1) != TYPE_MAIN_VARIANT (type2))
+ return false;
type1 = cp_build_qualified_type (type1, TYPE_UNQUALIFIED);
type2 = cp_build_qualified_type (type2, TYPE_UNQUALIFIED);
Ciao,
Michael.
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