Move PERL_ASYNC_CHECK() from the runloop to control flow OPs.

For the typical code this gives a 5% speedup, and removes the cost of "safe
signals". Tight looping code will show less gains, but should never be slower.

Subtle bugs might remain - there might be constructions that enter the runloop
(where signals used to be dispatched) but don't contain any PERL_ASYNC_CHECK()
calls themselves.

1 files changed, 2 insertions, 0 deletions

diff --git a/scope.c b/scope.c
index 2a9d2d0772..6ee1254b60 100644
--- a/scope.c
+++ b/scope.c
@@ -1115,6 +1115,8 @@ Perl_leave_scope(pTHX_ I32 base)
     }
 
     PL_tainted = was;
+
+    PERL_ASYNC_CHECK();
 }
 
 void