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Re: How to migrate POINTER_TYPE_OVERFLOW_UNDEFINED for GCC v8.x?


Hi Bin,

Thanks for your kind response!


在 2017年08月04日 15:45, Bin.Cheng 写道:
On Fri, Aug 4, 2017 at 8:00 AM, Leslie Zhai <lesliezhai@llvm.org.cn> wrote:
Hi GCC developers,

As ChangeLog mentioned:

2017-08-01  Bin Cheng <bin.cheng@arm.com>

     * tree.h (POINTER_TYPE_OVERFLOW_UNDEFINED): Delete.


Then how to migrate it for GCC v8.x? for example:

Constant *Result = POINTER_TYPE_OVERFLOW_UNDEFINED ? A : B;

migrated to

Constant *Result = A;
Yes, basically this is what I did in the patch: simply assuming TRUE
and simplifying the expression.

I migrated to GCC v8.x now https://github.com/xiangzhai/dragonegg/commit/d78389c502f5a06b21fcf1a1590e44451e59f461 thanks for your patch's hint :) it can't work for GCC v8.x, even though compiled without error, but able to work for GCC v4.6 and v4.8, I am stuck at rtl_opt_pass https://gcc.gnu.org/ml/gcc/2017-08/msg00045.html
hope I can figure it out the root cause.



Thanks,
bin

because there was a patch 'Make pointer overflow always undefined and remove
the macro' https://patchwork.ozlabs.org/patch/792677/

please give me some hint, thanks a lot!

--
Regards,
Leslie Zhai - a LLVM developer https://reviews.llvm.org/p/xiangzhai/




--
Regards,
Leslie Zhai - a LLVM developer https://reviews.llvm.org/p/xiangzhai/


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