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Sergei, Thank you for your attention. My target is a custom VLIW DSP. I am not sure dependency dag is correct when it gets scheduled and packetized. Months ago, I submitted a bug at http://llvm.org/bugs/show_bug.cgi?id=17894 which explained more details. I am not sure my understanding of this bug is proper, but modified my local codes this way and it works for my target when scheduling and