Optimization for vararg tables

A vararg table can be virtual. If the vararg table is used only as
a base in indexing expressions, the code does not need to create an
actual table for it. Instead, it compiles the indexing expressions
into direct accesses to the internal vararg data.

1 files changed, 6 insertions, 0 deletions

diff --git a/lvm.c b/lvm.c
index d88a80d1..3ce7e87f 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1926,6 +1926,12 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
         Protect(luaT_getvarargs(L, ci, ra, n));
         vmbreak;
       }
+      vmcase(OP_GETVARG) {
+        StkId ra = RA(i);
+        TValue *rc = vRC(i);
+        luaT_getvararg(ci, ra, rc);
+        vmbreak;
+      }
       vmcase(OP_VARARGPREP) {
         ProtectNT(luaT_adjustvarargs(L, ci, cl->p));
         if (l_unlikely(trap)) {  /* previous "Protect" updated trap */