* Why is debug_insn built into DDG?
@ 2010-07-15 14:47 Bingfeng Mei
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From: Bingfeng Mei @ 2010-07-15 14:47 UTC (permalink / raw)
To: gcc; +Cc: aoliva
Hello,
I started to look at VTA recently and check whether our port passes
the -fcompare-debug test. Our port contains some extra passes for
our VLIW target.
What I have trouble is with our modulo scheduling pass (based on
IMS algorithm). I noticed that debug_insns are built into DDG,
and has ANTI-dependence edge drawn between other instruction and them.
This dependencies will affect calculation of ASAP, ALAP etc, therefore
affect ordering algorithm and final scheduling results. Why these
debug_insns are needed in the DDG in the first place? They are skipped
during scheduling anyway. Isn't it waste of compilation time?
Thanks,
Bingfeng
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2010-07-15 14:47 Why is debug_insn built into DDG? Bingfeng Mei
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