gc: disable z() macro.

* gc.h (z): turn off. This is not achieving its purpose of
stopping spurious retention of objects, and adds a fraction
of a percent of execution overhead.

1 files changed, 5 insertions, 0 deletions

diff --git a/gc.h b/gc.h
index 8f7b44ae..9b41492c 100644
--- a/gc.h
+++ b/gc.h
@@ -68,4 +68,9 @@ extern val break_obj;
 #define FREE      0x200
 
 INLINE val zap(volatile val *loc) { val ret = *loc; *loc = nil; return ret; }
+
+#if CONFIG_ZAP_DEAD_LOCATIONS
 #define z(lvalue) zap(&lvalue)
+#else
+#define z(lvalue) (lvalue)
+#endif