diff options
Diffstat (limited to 'op.c')
| -rw-r--r-- | op.c | 30 |
1 files changed, 24 insertions, 6 deletions
@@ -6600,18 +6600,38 @@ Perl_peep(pTHX_ register OP *o) } case OP_SORT: { - /* make @a = sort @a act in-place */ - /* will point to RV2AV or PADAV op on LHS/RHS of assign */ OP *oleft, *oright; OP *o2; - o->op_opt = 1; - /* check that RHS of sort is a single plain array */ oright = cUNOPo->op_first; if (!oright || oright->op_type != OP_PUSHMARK) break; + + /* reverse sort ... can be optimised. */ + if (!cUNOPo->op_sibling) { + /* Nothing follows us on the list. */ + OP *reverse = o->op_next; + + if (reverse->op_type == OP_REVERSE && + (reverse->op_flags & OPf_WANT) == OPf_WANT_LIST) { + OP *pushmark = cUNOPx(reverse)->op_first; + if (pushmark && (pushmark->op_type == OP_PUSHMARK) + && (cUNOPx(pushmark)->op_sibling == o)) { + /* reverse -> pushmark -> sort */ + o->op_private |= OPpSORT_REVERSE; + op_null(reverse); + pushmark->op_next = oright->op_next; + op_null(oright); + } + } + } + + /* make @a = sort @a act in-place */ + + o->op_opt = 1; + oright = cUNOPx(oright)->op_sibling; if (!oright) break; @@ -6698,8 +6718,6 @@ Perl_peep(pTHX_ register OP *o) break; } - - default: o->op_opt = 1; break; |