[Bug other/48434] New: Large SpecCPUFP Performance Regression for Thumb-2

[ibolton at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48434

           Summary: Large SpecCPUFP Performance Regression for Thumb-2
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ibolton@gcc.gnu.org
              Host: arm-linux-gnueabi
            Target: arm-linux-gnueabi
             Build: arm-linux-gnueabi


At least once a week, we measure SpecCPU2000 performance for Thumb-2 on a
Cortex-A9.

On Monday, all was well, but on Wednesday, there was a large performance
regression across the board on SpecFP (except for Mesa and Facerec).  Overall
FP score has dropped by 25%.

Known good revision: r171422
Know bad revision: r171723

I am currently bisecting to find the problem commit.