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Re: Is there a way to dump LTO IR?


On Fri, Jan 23, 2015 at 9:26 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64754
>
> is a LTO bug where stage 1 and stage 2 compilers generate
> different LTO IR.  Is there  a way to dump LTO IR to see the
> actual difference in LTO IR?

No.  I've had multiple incarnations of local patches to dump stuff
during LTO IR write and LTO IR read so I could match them but
never committed anything because all this stuff is in the hot path.

I wonder if we can make a GCC plugin do it though, via re-using
existing lto/tree-streamer.c and some preprocessor defines that
switches between plugin and GCC mode...

OTOH I had the idea to make the IL self-descriptive to some extent
(in a debug mode, of course).

Richard.

> Thanks.
>
> --
> H.J.


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