[LLVMdev] Opinions Wanted: New asm Comments

David A. Greene greened at obbligato.org
Fri Jul 15 13:54:21 PDT 2011

Chris Lattner <clattner at apple.com> writes:

>> How would you prefer this work?  Even if the output were controlled by
>> NDEBUG, I feel the added pattern comments make the asm file too
>> cluttered even for day-to-day compiler developers.  This is really a
>> feature to debug instruction selection problems.  That's why I put it
>> under the control of a separate option.
> It's not really clear how this should work.  I'm primarily concerned
> that it will cause substantiate table/code bloat that doesn't make
> sense for a shipping compiler.

Ok, in that case I think we'll need a TableGen flag to control whether
this information gets generated.  A debug build would include it, a
release build would not.

> I agree that not all compiler hackers will want to see it, I'd
> suggest adding a cl::opt that is only even available when built with
> assertions on.

Assertions or Debug?  I would think we'd want it in the latter.


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