From 84acf4e3f38d01c72ae077db1234c880658c10aa Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 9 Apr 2013 15:31:17 +0900
Subject: preparation for tail call optimization (still has bugs)

---
 src/codegen.c |  8 ++++++++
 src/vm.c      | 11 ++++++-----
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/src/codegen.c b/src/codegen.c
index 83d0136ef..d9fc10657 100644
--- a/src/codegen.c
+++ b/src/codegen.c
@@ -317,6 +317,14 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
         s->iseq[s->pc-1] = MKOP_A(c0, 0);
         genop(s, MKOP_AB(OP_RETURN, 0, OP_R_NORMAL));
         return;
+#if 0
+      case OP_SEND:
+        if (GETARG_B(i) == OP_R_NORMAL && GETARG_A(i) == GETARG_A(i0)) {
+          s->iseq[s->pc-1] = MKOP_ABC(OP_TAILCALL, GETARG_A(i0), GETARG_B(i0), GETARG_C(i0));
+          return;
+        }
+        break;
+#endif
       default:
         break;
       }
diff --git a/src/vm.c b/src/vm.c
index 468396a51..13058fc28 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1195,9 +1195,11 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
       NEXT;
     }
 
+    L_RETURN:
+      i = MKOP_AB(OP_RETURN, GETARG_A(i), OP_R_NORMAL);
+      /* fall through */
     CASE(OP_RETURN) {
       /* A      return R(A) */
-    L_RETURN:
       if (mrb->exc) {
         mrb_callinfo *ci;
         int eidx;
@@ -1333,7 +1335,6 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
         }
       }
 
-
       /* replace callinfo */
       ci = mrb->ci;
       ci->mid = mid;
@@ -1658,7 +1659,7 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
 } while (0)
 
     CASE(OP_EQ) {
-      /* A B C  R(A) := R(A)<R(A+1) (Syms[B]=:<,C=1)*/
+      /* A B C  R(A) := R(A)<R(A+1) (Syms[B]=:==,C=1)*/
       int a = GETARG_A(i);
       if (mrb_obj_eq(mrb, regs[a], regs[a+1])) {
         SET_TRUE_VALUE(regs[a]);
@@ -1676,7 +1677,7 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
     }
 
     CASE(OP_LE) {
-      /* A B C  R(A) := R(A)<R(A+1) (Syms[B]=:<,C=1)*/
+      /* A B C  R(A) := R(A)<=R(A+1) (Syms[B]=:<=,C=1)*/
       OP_CMP(<=);
       NEXT;
     }
@@ -1688,7 +1689,7 @@ mrb_run(mrb_state *mrb, struct RProc *proc, mrb_value self)
     }
 
     CASE(OP_GE) {
-      /* A B C  R(A) := R(A)<R(A+1) (Syms[B]=:<,C=1)*/
+      /* A B C  R(A) := R(A)<=R(A+1) (Syms[B]=:<=,C=1)*/
       OP_CMP(>=);
       NEXT;
     }
-- 
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