[Bug middle-end/41193] New: slow compilation with graphite

[jv244 at cam dot ac dot uk]

after the fix for PR40965, I retested trunk on CP2K. There is one particularly
slow compile, for the attached testcase, which goes 

w/o -fgraphite :   8s
w   -fgraphite : 371s

-ftime-report points at:

Graphite loop transforms: 364.61 (98%) usr   0.96 (91%) sys 365.55 (98%) wall

full compile line

gfortran -fgraphite -c -O2 -ffast-math -funroll-loops -ftree-vectorize
-march=native -ftime-report tmp.f90

with gfortran -v 

Target: x86_64-unknown-linux-gnu
Configured with: /data03/vondele/gcc_trunk/gcc/configure --disable-bootstrap
--prefix=/data03/vondele/gcc_trunk/build --enable-languages=c,c++,fortran
--disable-multilib --with-ppl=/data03/vondele/gcc_trunk/build/
--with-cloog=/data03/vondele/gcc_trunk/build/
Thread model: posix
gcc version 4.5.0 20090830 (experimental) [trunk revision 151229] (GCC)
COLLECT_GCC_OPTIONS='-c' '-O2' '-ffast-math' '-funroll-loops'
'-ftree-vectorize'  '-v'

/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/f951
tmp.f90 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param
l1-cache-line-size=64 --param l2-cache-size=1024 -mtune=k8 -quiet -dumpbase
tmp.f90 -auxbase tmp -O2 -version -ffast-math -funroll-loops -ftree-vectorize
-fintrinsic-modules-path
/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/finclude
-o /tmp/cch50n1i.s
GNU Fortran (GCC) version 4.5.0 20090830 (experimental) [trunk revision 151229]
(x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.3.1 20080507 (prerelease) [gcc-4_3-branch
revision 135036], GMP version 4.2.2, MPFR version 2.3.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU Fortran (GCC) version 4.5.0 20090830 (experimental) [trunk revision 151229]
(x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.3.1 20080507 (prerelease) [gcc-4_3-branch
revision 135036], GMP version 4.2.2, MPFR version 2.3.1
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
COLLECT_GCC_OPTIONS='-c' '-O2' '-ffast-math' '-funroll-loops'
'-ftree-vectorize'  '-v'
 as -V -Qy -o tmp.o /tmp/cch50n1i.s
GNU assembler version 2.18.50 (x86_64-suse-linux) using BFD version (GNU
Binutils; openSUSE 11.0) 2.18.50.20080409-11.1
COMPILER_PATH=/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/:/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/:/data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/:/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/:/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/:/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-c' '-O2' '-ffast-math' '-funroll-loops'
'-ftree-vectorize'  '-v'


-- 
           Summary: slow compilation with graphite
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41193