Avoid redundant reload of PL_op in the runloop.

(gcc, at least, generates suboptimal code without this dirty great hint)

diff --git a/run.c b/run.c
index 20c711a..eb465da 100644 (file)
--- a/run.c
+++ b/run.c
@@ -37,7 +37,8 @@ int
 Perl_runops_standard(pTHX)
 {
     dVAR;
-    while ((PL_op = CALL_FPTR(PL_op->op_ppaddr)(aTHX))) {
+    register OP *op = PL_op;
+    while ((PL_op = op = CALL_FPTR(op->op_ppaddr)(aTHX))) {
     }
 
     TAINT_NOT;