continuations: don't fixup pointers if delta is zero.

* unwind.c (revive_cont): If delta is zero, skip the loop.
This is an important optimization. The delta zero case
can occur frequently; I have observed it.

1 files changed, 1 insertions, 1 deletions

diff --git a/unwind.c b/unwind.c
index a1f0989d..b89bf991 100644
--- a/unwind.c
+++ b/unwind.c
@@ -892,7 +892,7 @@ static val revive_cont(val dc, val arg)
 
     memcpy(space, cont->stack, cont->size);
 
-    for (ptr = space; ptr < space + cont->size; ptr += sizeof (cnum))
+    for (ptr = space; delta && ptr < space + cont->size; ptr += sizeof (cnum))
     {
       uint_ptr_t *wordptr = coerce(uint_ptr_t *, ptr);
       uint_ptr_t word;