nobu	2018-04-23 18:52:23 +0900 (Mon, 23 Apr 2018)

  New Revision: 63246

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63246

  Log:
    compile.c: insn before pop
    
    * compile.c (iseq_peephole_optimize): more eliminatable
      instructions before `pop` without side effects.

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 63245)
+++ compile.c	(revision 63246)
@@ -2909,6 +2909,11 @@ iseq_peephole_optimize(rb_iseq_t *iseq, https://github.com/ruby/ruby/blob/trunk/compile.c#L2909
 	    enum ruby_vminsn_type previ = ((INSN *)prev)->insn_id;
 	    if (previ == BIN(putobject) || previ == BIN(putnil) ||
 		previ == BIN(putself) || previ == BIN(putstring) ||
+		previ == BIN(dup) ||
+		previ == BIN(getlocal) ||
+		previ == BIN(getblockparam) ||
+		previ == BIN(getblockparamproxy) ||
+		/* getinstancevariable may issue a warning */
 		previ == BIN(duparray)) {
 		/* just push operand or static value and pop soon, no
 		 * side effects */

--
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