[Bug tree-optimization/56522] [4.8 Regression] Bytemark ASSIGNMENT 9% / 11% slower

rguenth at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Mon Mar 11 08:45:00 GMT 2013


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56522

--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> 2013-03-11 08:45:04 UTC ---
(In reply to comment #13)
> There is almost no difference with reduced test case. Assignment in nbench can
> be tested with:
> ./nbench -cCOM.DAT
> 
> where file COM.DAT has content:
> 
> ALLSTATS=F
> DONUMSORT=F
> DOSTRINGSORT=F
> DOBITFIELD=F
> DOEMF=F
> DOFOUR=F
> DOASSIGN=T
> DOIDEA=F
> DOHUFF=F
> DONNET=F
> DOLU=F
> 
> Which CPU have you tested?

processor       : 7
vendor_id       : GenuineIntel
cpu family      : 6
model           : 30
model name      : Intel(R) Core(TM) CPU            860  @ 2.80GHz
stepping        : 5

note that there were _zero_ assembly differences with/without the patch
apart from using different register numbers and one single switched
bb order.



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