Reload bug & SRA oddness

[Bernd Schmidt]

Alexandre Oliva wrote:

> This patch reintroduces some of the patch that I reverted on
> 2007-04-30, meant to scalarize into a single variable multiple small
> fields that are not accessed directly in the source code, with the
> following major changes since the original patch, installed on
> 2007-04-05:

I've tested this a bit, and on i386 it seems to have a beneficial effect
on the set of sources I tried.  On the Blackfin it does nothing at all.

> - only assignments to BIT_FIELD_REFs are regarded as both input and
>   output now; the use_all machinery is restored

Sounds like there's room for improvement.  Do you think it would be hard
to solve this accurately?

Is the cost logic in decide_block_copy still correct after this patch?
It seems like it could be unnecessarily pessimistic.


Bernd
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