codegen: avoid unnecessary OP_MOVE after CASE

c029c6c4 · Yukihiro "Matz" Matsumoto · 23c4ad08 · c029c6c4
Commit c029c6c4 authored Dec 03, 2016 by Yukihiro "Matz" Matsumoto
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mrbgems/mruby-compiler/core/codegen.c mrbgems/mruby-compiler/core/codegen.c +3 -1

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--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -1520,7 +1520,9 @@ codegen(codegen_scope *s, node *tree, int val)
        genop(s, MKOP_A(OP_LOADNIL, cursp()));
        if (pos3) dispatch_linked(s, pos3);
        if (head) pop();
-        genop(s, MKOP_AB(OP_MOVE, cursp(), pos));
+        if (cursp() != pos) {
+          genop(s, MKOP_AB(OP_MOVE, cursp(), pos));
+        }
        push();
      }
      else {