Negation in constant folding of '>>' may overflow

1 files changed, 5 insertions, 0 deletions

diff --git a/lvm.h b/lvm.h
index 1bc16f3a..dba1ad27 100644
--- a/lvm.h
+++ b/lvm.h
@@ -110,6 +110,11 @@ typedef enum {
       luaC_barrierback(L, gcvalue(t), v); }
 
 
+/*
+** Shift right is the same as shift left with a negative 'y'
+*/
+#define luaV_shiftr(x,y)	luaV_shiftl(x,intop(-, 0, y))
+
 
 
 LUAI_FUNC int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2);