From 09376f9b2a6ce2c56f5a4fc7abb88ea4e68c59e3 Mon Sep 17 00:00:00 2001
From: Yukihiro Matsumoto <matz@ruby-lang.org>
Date: Tue, 23 Oct 2012 14:14:26 +0900
Subject: skip useless OP_MOVE in peephole optimization

---
 src/codegen.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/codegen.c')

diff --git a/src/codegen.c b/src/codegen.c
index df5bc2acf..b0e6f8fd1 100644
--- a/src/codegen.c
+++ b/src/codegen.c
@@ -170,6 +170,10 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
 
     switch (c1) {
     case OP_MOVE:
+      if (GETARG_A(i) == GETARG_B(i)) {
+	/* skip useless OP_MOVE */
+	return;
+      }
       if (val) break;
       switch (c0) {
       case OP_MOVE:
-- 
cgit v1.2.3