GCC trunk gets an internal compiler error when building SPEC CPU2000 test
200.sixtrack with "-O2 -floop-parallelize-all -fprefetch-loops-arrays" on
powerpc-linux, as demonstrated by this minimized testcase:
subroutine phasad(t,i,ium)
implicit none
real t(5,4)
integer i,l,ll,ium
do l=1,2
ll=2*l
do i=1,ium
t(i,ll-1)=t(i,ll-1)+t(i,ll)
enddo
enddo
return
end
elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/gfortran -c -O2
-floop-parallelize-all -fprefetch-loop-arrays bug.f
bug.f: In function ‘phasad’:
bug.f:1:0: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
The failure has existed since the large Graphite merge that introduced
-fgraphite-force-parallel which was later renamed to -floop-parallelize-all.
The segmentation fault occurs in initialize_matrix_A at tree-data-ref.c:1914
when A[index] has the value (lambda_vector) 0xa.
--
Summary: segfault in tree-data-ref.c with Graphite building
200.sixtrack
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42326
