nobu	2016-04-23 23:12:27 +0900 (Sat, 23 Apr 2016)

  New Revision: 54733

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54733

  Log:
    compile.c: remove redundant trace insn
    
    * compile.c (iseq_peephole_optimize): remove successive line trace
      instructions except for the last.

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 54732)
+++ compile.c	(revision 54733)
@@ -2279,6 +2279,17 @@ iseq_peephole_optimize(rb_iseq_t *iseq, https://github.com/ruby/ruby/blob/trunk/compile.c#L2279
 	    }
 	}
     }
+
+    #define IS_TRACE_LINE(insn) \
+	(IS_INSN_ID(insn, trace) && \
+	 OPERAND_AT(insn, 0) == INT2FIX(RUBY_EVENT_LINE))
+    if (IS_TRACE_LINE(iobj) && iobj->link.prev && IS_INSN(iobj->link.prev)) {
+	INSN *piobj = (INSN *)iobj->link.prev;
+	if (IS_TRACE_LINE(piobj)) {
+	    REMOVE_ELEM(iobj->link.prev);
+	}
+    }
+
     return COMPILE_OK;
 }
 

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