Re: Serious SPEC CPU 2006 FP performance regressions on IA32

[Uros Bizjak]

H. J. Lu wrote:

Gcc 4.3 revision 119497 has very poor SPEC CPU 2006 FP performance
regressions on P4, Pentium M and Core Duo, comparing aganst
gcc 4.2 20060910. With -O2, the typical regressions look like
 

I think that you are looking at the same problem as 
http://gcc.gnu.org/ml/gcc/2006-12/msg00017.html.

Is that related to recent i386 backend FP changes?

 

I _think_ that they should not have such impact.

Uros.