[Bug tree-optimization/59817] New: ICE in extract_affine_chrec with -O2 -ftree-loop-linear

[anton at samba dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59817

            Bug ID: 59817
           Summary: ICE in extract_affine_chrec with -O2
                    -ftree-loop-linear
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anton at samba dot org

The following testcase:


c -O2 -ftree-loop-linear 

      SUBROUTINE PREPD(ICAST,ICAS,ICASX,ICAS1,ICAS2,NDET,NM,III,IMP,
     *                 CASMIN)
      LOGICAL CASMIN
      DIMENSION ICAST(NDET,NM),IMP(NM)
      IF(CASMIN) THEN
         DO K=1,NDET
            DO L=1,NM
               IF(L.EQ.K-1) ICAST(K,L) = 1
            END DO
         END DO
      END IF


fails on a powerpc64-linux build from today with:


# gfortran -c -O2 -ftree-loop-linear testcase.f
testcase.f: In function ‘prepd’:
testcase.f:3:0: internal compiler error: in extract_affine_chrec, at
graphite-sese-to-poly.c:620
       SUBROUTINE PREPD(ICAST,ICAS,ICASX,ICAS1,ICAS2,NDET,NM,III,IMP,
 ^
0x10cf684f extract_affine_chrec
        ../../gcc/gcc/graphite-sese-to-poly.c:619
0x10cf684f extract_affine
        ../../gcc/gcc/graphite-sese-to-poly.c:803
0x10cf62fb extract_affine
        ../../gcc/gcc/graphite-sese-to-poly.c:842
0x10cf843f pdr_add_memory_accesses
        ../../gcc/gcc/graphite-sese-to-poly.c:1486
0x10cf843f build_poly_dr
        ../../gcc/gcc/graphite-sese-to-poly.c:1583
0x10cf843f build_pbb_drs
        ../../gcc/gcc/graphite-sese-to-poly.c:1846
0x10cf843f build_scop_drs
        ../../gcc/gcc/graphite-sese-to-poly.c:1929
0x10cfa8d7 build_poly_scop(scop*)
        ../../gcc/gcc/graphite-sese-to-poly.c:3171
0x10cdcabb graphite_transform_loops()
        ../../gcc/gcc/graphite.c:300
0x10cdd227 graphite_transforms
        ../../gcc/gcc/graphite.c:332
0x10cdd227 execute
        ../../gcc/gcc/graphite.c:416