[Bug middle-end/40029] New: [4.5 Regression] Big degradation on swim/mgrid on powerpc 32/64 after alias improvement merge (gcc r145494)

[luisgpm at linux dot vnet dot ibm dot com]

CPU2000's swim and mgrid had ~10% slowdown after the merge of the alias
improvement branch.

GCC was configured with the following:

/gcc/HEAD/configure --target=powerpc64-linux --host=powerpc64-linux
--build=powerpc64-linux --with-cpu=default32 --enable-threads=posix
--enable-shared --enable-__cxa_atexit --with-gmp=/gmp --with-mpfr=mpfr
--with-long-double-128 --enable-decimal-float --enable-secure-plt
--disable-bootstrap --disable-alsa --prefix=/install/gcc/HEAD
build_alias=powerpc64-linux host_alias=powerpc64-linux
target_alias=powerpc64-linux --enable-languages=c,c++,fortran --no-create
--no-recursion

Compile flags used: -m[32|64] -O3 -mcpu=power[4|5|6] -ffast-math
-ftree-loop-linear -funroll-loops -fpeel-loops

Will provide more details soon.


-- 
           Summary: [4.5 Regression] Big degradation on swim/mgrid on
                    powerpc 32/64 after alias improvement merge (gcc
                    r145494)
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: luisgpm at linux dot vnet dot ibm dot com
 GCC build triplet: powerpc*-*-*
  GCC host triplet: powerpc*-*-*
GCC target triplet: powerpc*-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40029