Re: Some regressions from the dataflow merge

[Kenneth Zadeck <zadeck at naturalbridge dot com>]

Dave Korn wrote:
> On 12 June 2007 15:05, Kenneth Zadeck wrote:
>
>   
>> Richard Guenther wrote:
>>     
>>> On ia64 SPEC2000 I see fma3d and applu now miscompare, and we have
>>> on x86_64 some performance regressions with Botan (a collection of
>>> cryptographic algorithms (see
>>> http://www.suse.de/~gcctest/c++bench/botan/)) - those are reasonably small
>>> enough to investigate, but wait another day in case its just noise. 
>>>
>>> Otherwise things look smooth as expected.
>>>
>>> Richard.
>>>
>>>       
>> I looked at the graphs here and i do not see a regression except in the
>> compile time.
>>     
>
>   Fortran has a testcase that trips one on x86/cygwin: see
> http://gcc.gnu.org/ml/gcc/2007-06/msg00291.html.  Perhaps you can comment on
> whether df_live (== df->problems_by_index[DF_LIVE]) should ever be NULL?
>
>
>     cheers,
>       DaveK
>   
>From what i can gather from looking at the "stacktrace", the problem is that
ix86_eax_live_at_start_p is only called on cigwin and of course we did
not check cigwin. 

This is an easy fix.

Change the macro "DF_LIVE_OUT" in this function to the function call
"df_get_live_out".  It takes the same parameter and returns the same thing.

I believe this will fix the problem.

kenny