Add defined_ivar instruction

This is a variation of the `defined` instruction, for use when we
are checking for an instance variable. Splitting this out as a
separate instruction lets us skip some checks, and it also allows
us to use an instance variable cache, letting shape analysis
speed up the operation further.

1 files changed, 2 insertions, 3 deletions

diff --git a/compile.c b/compile.c
index 82a6d0ef4e..f4bb2c9107 100644
--- a/compile.c
+++ b/compile.c
@@ -5460,9 +5460,8 @@ defined_expr0(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
 
 #define PUSH_VAL(type) (needstr == Qfalse ? Qtrue : rb_iseq_defined_string(type))
       case NODE_IVAR:
-        ADD_INSN(ret, line_node, putnil);
-        ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_IVAR),
-                  ID2SYM(node->nd_vid), PUSH_VAL(DEFINED_IVAR));
+        ADD_INSN3(ret, line_node, defined_ivar,
+                  ID2SYM(node->nd_vid), get_ivar_ic_value(iseq,node->nd_vid), PUSH_VAL(DEFINED_IVAR));
         return;
 
       case NODE_GVAR: