[Bug tree-optimization/50480] New: 10% performance regression on Spec2006 410.bwaves

[kirill.yukhin at intel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50480

             Bug #: 50480
           Summary: 10% performance regression on Spec2006 410.bwaves
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: kirill.yuk...@intel.com


Hi,
Recently Richard fixed this http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49957
According to my measurements, fix for that bug caused (on Spec2006):

For SandyBride CPU:
* 410.bwaves degradation is -9.54% for peak32
* 410.bwaves degradation is -6.91% for base32
* 410.bwaves improvement is 1.00% for peak64
* 410.bwaves improvement is 0.91% 3or base64

For Corei7 CPU:
* 410.bwaves degradation is -3.91% for peak32
* 410.bwaves degradation is -3.91% for base32
* 410.bwaves improvement is 1.94% for peak64
* 410.bwaves improvement is 3.23% 3or base64

For AMD (Phenom(tm) II X3 B75) CPU:
* 410.bwaves degradation is -7.32% for peak32
* 410.bwaves degradation is -6.56% for base32
* 410.bwaves improvement is 2.01% for peak64
* 410.bwaves degradation is -1.34% 3or base64