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Re: patch for elimination to SP when it is changed in RTL (PR57293)


> There is a comment:
> 
>    FIXME: the flags is incorrectly enabled for amdfam10, Bulldozer,
>    Bobcat and Generic.  This is because disabling it causes large
>    regression on mgrid due to IRA limitation leading to unecessary
>    use of the frame pointer in 32bit mode.  */
> DEF_TUNE (X86_TUNE_ACCUMULATE_OUTGOING_ARGS, "accumulate_outgoing_args",
>           m_PPRO | m_P4_NOCONA | m_ATOM | m_SLM | m_AMD_MULTIPLE | m_GENERIC)
> 
> Does this mean we can enable it for m_AMD_MULTIPLE and
> m_GENERIC?  If this bug is fixed, we should add

I hope we can add it for fam10/buldozer/generic.  m_AMD_MULTIPLE covers also
earier targets.  Of course we need to benchmark it first, I will configure benchmarking
now.

Thanks for looking into this!

Honza
> 
> -mtune-ctrl=accumulate_outgoing_args
> 
> to gcc.target/i386/pr9771-1.c since it may be disabled by
> default.
> 
> Thanks.
> 
> -- 
> H.J.


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