http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50439
Bug #: 50439
Summary: gfortran infinite loop with -floop-interchange
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: pthau...@gcc.gnu.org
CC: berg...@gcc.gnu.org
Host: powerpc64-linux
Target: powerpc64-linux
Build: powerpc64-linux
The following testcase (reduced from cpu2000 benchmark 200.sixtrack, comnul.f)
results in gfortran looping when compiled with -floop-interchange.
C gfortran -c -O3 -floop-interchange
C-----------------------------------------------------------------------
subroutine comnul
C-----------------------------------------------------------------------
implicit real*8 (a-h,o-z)
parameter(zero=0.0d0,half=0.5d0,one=1.0d0)
common/secom/rtc(9,18,10,5),rts(9,18,10,5)
save
C-----------------------------------------------------------------------
do 110 i1=1,9
do 110 i2=1,18
do 110 i3=1,10
do 110 i4=1,5
rtc(i1,i2,i3,i4)=zero
rts(i1,i2,i3,i4)=zero
110 continue
return
end
I stopped it a few times under the debugger and following appeared to be common
chain in backtrace:
#6 0x0000000010d2b694 in Parma_Polyhedra_Library::PIP_Problem::solve
(this=0x11689bd0)
at /home/pthaugen/src/ppl-0.11.2/src/PIP_Problem.cc:215
#7 0x0000000010d2b984 in Parma_Polyhedra_Library::PIP_Problem::is_satisfiable
(
this=<optimized out>) at
/home/pthaugen/src/ppl-0.11.2/src/PIP_Problem.cc:649
#8 0x0000000010c1d864 in ppl_PIP_Problem_is_satisfiable (pip=<optimized out>)
at
/home/pthaugen/src/ppl-0.11.2/interfaces/C/ppl_c_implementation_common.cc:2298
#9 0x0000000010ae2dd4 in ppl_powerset_is_empty (ps=0x115bcb40)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-ppl.c:553
#10 0x0000000010adb2ac in build_lexicographical_constraint
(direction=<optimized out>,
offset=<optimized out>, tdim=<optimized out>, dim=<optimized out>,
bag=<optimized out>)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:396
#11 dependence_polyhedron (original_scattering_p=<optimized out>,
direction=<optimized out>,
pdr2=<optimized out>, pdr1=<optimized out>)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:479
#12 new_poly_ddr (pdr1=<optimized out>, pdr2=0x114b80c0, direction=-1,
original_scattering_p=<optimized out>)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:534
#13 0x0000000010adc188 in graphite_legal_transform_dr (pdr2=<optimized out>,
pdr1=<optimized out>) at
/home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:631
#14 graphite_legal_transform_bb (pbb2=<optimized out>, pbb1=<optimized out>)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:710
#15 graphite_legal_transform (scop=0x114c0200)
at /home/pthaugen/src/gcc/trunk/gcc/gcc/graphite-dependences.c:729
...
GCC configure:
> ~/install/gcc/trunk/bin/gcc -v
Using built-in specs.
COLLECT_GCC=/home/pthaugen/install/gcc/trunk/bin/gcc
COLLECT_LTO_WRAPPER=/home/pthaugen/install/gcc/trunk/libexec/gcc/powerpc64-linux/4.7.0/lto-wrapper
Target: powerpc64-linux
Configured with: /home/pthaugen/src/gcc/trunk/gcc/configure
--prefix=/home/pthaugen/install/gcc/trunk --target=powerpc64-linux
--host=powerpc64-linux --build=powerpc64-linux --enable-secureplt
--enable-threads=posix --enable-shared --enable-__cxa_atexit
--with-long-double-128 --enable-decimal-float --disable-alsa --enable-checking
--with-lto --with-as=/home/wschmidt/binutils/install/bin/as
--with-ld=/home/wschmidt/binutils/install/bin/ld
--with-gmp=/home/pthaugen/install/gcc-host-libs
--with-mpfr=/home/pthaugen/install/gcc-host-libs
--with-mpc=/home/pthaugen/install/gcc-host-libs
--with-ppl=/home/pthaugen/install/gcc-host-libs
--with-cloog=/home/pthaugen/install/gcc-host-libs
--with-host-libstdcxx=-Wl,-Bstatic,-L/home/pthaugen/install/gcc-host-libs/lib,-lstdc++,-Bdynamic,-lm
--enable-languages=c,fortran,c++ --disable-bootstrap
Thread model: posix
gcc version 4.7.0 20110913 (experimental) [trunk revision 178814] (GCC)
Using the following prereq libs:
cloog-ppl-0.15.10
gmp-4.3.2
mpc-0.9
mpfr-3.0.0
ppl-0.11.2
gfortran also loops with -floop-interchange when building cpu2006 benchmark
416.gamess file mpcint.fppized.f.
