Re: Patch: PR40900, extending call patterns

[Bernd Schmidt <bernds at codesourcery dot com>]

On 04/30/2010 10:57 AM, Paolo Bonzini wrote:
> However, I agree with Andrew that all the information should already be
> there (through the promote_function_mode hook), it's just that combine
> isn't trying hard enough.  Maybe something based on the attached patch?

When finished, it looks like the one below.  Simply setting
sign_bit_copies in record_dead_and_set_regs_1 doesn't work, and rather
than duplicating the bookkeeping I construct a small piece of RTL to
pass to record_value_for_reg that makes it do the right thing.

This works without modifying backends, but it has the drawback that it
can't optimize indirect calls since we're lacking a decl for them.

Testing now in progress on i686-linux.  Ok (this or the previous one)?


Bernd

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