From 5ac58b272d65cc9921048c076e35df1f42979725 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 25 Feb 2015 00:20:39 +0000
Subject: insns.def: reverse

* insns.def (reverse): add new instruction for massign.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49731 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 compile.c |  2 --
 insns.def | 22 ++++++++++++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/compile.c b/compile.c
index ed003772fc..deb403f579 100644
--- a/compile.c
+++ b/compile.c
@@ -2822,7 +2822,6 @@ compile_massign(rb_iseq_t *iseq, LINK_ANCHOR *ret, NODE *node, int poped)
 		    ADD_INSN(ret, nd_line(node), swap);
 		    expand = 0;
 		}
-#if 0
 		else if (llen > 2 && llen != rlen) {
 		    POP_ELEMENT(ret);
 		    adjust_stack(iseq, ret, nd_line(node), rlen, llen);
@@ -2833,7 +2832,6 @@ compile_massign(rb_iseq_t *iseq, LINK_ANCHOR *ret, NODE *node, int poped)
 		    last->insn_id = BIN(reverse);
 		    expand = 0;
 		}
-#endif
 	    }
 	}
 	if (expand) {
diff --git a/insns.def b/insns.def
index 81aca8faae..778999d7db 100644
--- a/insns.def
+++ b/insns.def
@@ -623,6 +623,28 @@ swap
     /* none */
 }
 
+/**
+  @c stack
+  @e reverse stack top N order.
+  @j スタックトップの n 個の値を逆転する。
+ */
+DEFINE_INSN
+reverse
+(rb_num_t n)
+(...)
+(...) // inc += 0;
+{
+    rb_num_t i;
+    VALUE *sp = STACK_ADDR_FROM_TOP(n);
+
+    for (i=0; i<n/2; i++) {
+	VALUE v0 = sp[i];
+	VALUE v1 = TOPN(i);
+	sp[i] = v1;
+	TOPN(i) = v0;
+    }
+}
+
 /**
   @c stack
   @e for stack caching.
-- 
cgit v1.2.3