be more optimal about clearing @_

p4raw-id: //depot/perl@6216

diff --git a/cop.h b/cop.h
index adf3863..e0a8127 100644 (file)
--- a/cop.h
+++ b/cop.h
@@ -107,8 +107,13 @@ struct block_sub {
 #endif /* USE_THREADS */
 
 /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
- * leave any */
-#define CLEAR_ARGARRAY()       av_clear(cx->blk_sub.argarray)
+ * leave any (a fast av_clear(ary), basically) */
+#define CLEAR_ARGARRAY(ary) \
+    STMT_START {                                                       \
+       AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary);                      \
+       SvPVX(ary) = (char*)AvALLOC(ary);                               \
+       AvFILLp(ary) = -1;                                              \
+    } STMT_END
 
 #define POPSUB(cx,sv)                                                  \
     STMT_START {                                                       \
@@ -124,7 +129,7 @@ struct block_sub {
                PL_curpad[0] = (SV*)cx->blk_sub.argarray;               \
            }                                                           \
            else {                                                      \
-               CLEAR_ARGARRAY();                                       \
+               CLEAR_ARGARRAY(cx->blk_sub.argarray);                   \
            }                                                           \
        }                                                               \
        sv = (SV*)cx->blk_sub.cv;                                       \