[Bug tree-optimization/54271] New: [4.7/4.8 Regression] libgcrypt CRC24RFC2440 30% slower

["wbrana at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54271

             Bug #: 54271
           Summary: [4.7/4.8 Regression] libgcrypt CRC24RFC2440 30% slower
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: wbrana@gmail.com


ftp://ftp.gnupg.org/gcrypt/libgcrypt/libgcrypt-1.5.0.tar.bz2

tests/benchmark --cipher-repetitions 100 --hash-repetitions 100 md crc24rfc2440

gcc 4.6 20120804
CRC24RFC2440  1660  1690  3420  1900  1670 10340ms

gcc 4.7 20120812
CRC24RFC2440  2520  2550  4230  2760  2520 14580ms

gcc 4.8 20120813
CRC24RFC2440  2550  2590  4220  2790  2550 14700ms

-O3 -pipe -march=core2 -mtune=core2 -fomit-frame-pointer -funroll-loops --param
max-unrolled-insns=64