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Re: [PATCH]: update to df for mainline.
- From: Daniel Berlin <dberlin at dberlin dot org>
- To: Bernd Schmidt <bernds_cb1 at t-online dot de>
- Cc: Kenneth Zadeck <zadeck at naturalbridge dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, Ian Lance Taylor <ian at airs dot com>, Vladimir Makarov <vmakarov at redhat dot com>, "F. Kenneth Zadeck" <kenneth dot zadeck at naturalbridge dot com>
- Date: Wed, 10 May 2006 21:52:09 -0400
- Subject: Re: [PATCH]: update to df for mainline.
- References: <44298EDB.5000804@naturalbridge.com> <4429BE69.5010307@t-online.de> <442AA1D3.4050007@naturalbridge.com> <446093C1.1090906@t-online.de> <4462310B.6070900@naturalbridge.com> <44625685.2050808@t-online.de>
>
> The first store is dead if A is a single register and the partial access
> is smaller and not using strict_low_part. The second store is
> documented to have undefined effects on the rest of the register in that
> case.
>
>> If there is a set of test that we can apply when setting the df_ref
>> _partial flag to ignore the cases where it really is to the entire word,
>> we will add this in the next flip of the patch.
>
> There's some code in flow.c's mark_set_1 which may be usable.
Are you referring to the part that checks to see whether the outer mode
size is less than the inner mode size?
Otherwise, I don't see it. :)