Give PerlIO::via its own Maintainers.pl entry

[perl5.git] / pp_hot.c

diff --git a/pp_hot.c b/pp_hot.c
index 852ff80..f8a61cb 100644 (file)
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -989,8 +989,19 @@ PP(pp_aassign)
     /* If there's a common identifier on both sides we have to take
      * special care that assigning the identifier on the left doesn't
      * clobber a value on the right that's used later in the list.
+     * Don't bother if LHS is just an empty hash or array.
      */
-    if (PL_op->op_private & (OPpASSIGN_COMMON)) {
+
+    if (    (PL_op->op_private & OPpASSIGN_COMMON)
+       &&  (
+              firstlelem != lastlelem
+           || ! ((sv = *firstlelem))
+           || SvMAGICAL(sv)
+           || ! (SvTYPE(sv) == SVt_PVAV || SvTYPE(sv) == SVt_PVHV)
+           || (SvTYPE(sv) == SVt_PVAV && AvFILL((AV*)sv) != -1)
+           || (SvTYPE(sv) == SVt_PVHV && HvKEYS((HV*)sv) != 0)
+           )
+    ) {
        EXTEND_MORTAL(lastrelem - firstrelem + 1);
        for (relem = firstrelem; relem <= lastrelem; relem++) {
            if ((sv = *relem)) {