From 819c9da8d2b37ed85a4a9213e5d596df5f1e4708 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 17 Feb 2016 11:03:27 +0900
Subject: peephole optimization for LOADNIL before STRCAT; ref #3110

---
 mrbgems/mruby-compiler/core/codegen.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'mrbgems/mruby-compiler/core/codegen.c')

diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 12f79b893..52611c19e 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -339,6 +339,12 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
           return 0;
         }
       }
+      if (c0 == OP_LOADNIL) {
+        if (GETARG_B(i) == GETARG_A(i0)) {
+          s->pc--;
+          return 0;
+        }
+      }
       break;
     case OP_JMPIF:
     case OP_JMPNOT:
-- 
cgit v1.2.3