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From: "Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/66352] New: [6 Regression] ICE in in dfs_enumerate_from, at cfganal.c:1195
Date: Sun, 31 May 2015 12:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66352

            Bug ID: 66352
           Summary: [6 Regression] ICE in in dfs_enumerate_from, at
                    cfganal.c:1195
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Joost.VandeVondele at mat dot ethz.ch
  Target Milestone: ---

Recent (last few days) regression :

> cat bug.f90
  SUBROUTINE matmul_test ( ntim,len)
    INTEGER, PARAMETER :: dp=8
    REAL(KIND=dp), ALLOCATABLE, DIMENSION(:, :) :: ma, mb, mc
    INTEGER :: siz,len, ntim
    DO i = 5, siz, 2
       len = 2**i + 1
       ALLOCATE ( ma ( len, len ), STAT = ierr )
       IF ( ierr /= 0 ) EXIT
       ALLOCATE ( mb ( len, len ), STAT = ierr )
       IF ( ierr /= 0 ) EXIT
       ALLOCATE ( mc ( len, len ), STAT = ierr )
       IF ( ierr /= 0 ) EXIT
       DO j = 1, ntim
          mc = MATMUL ( ma, mb )
       END DO
    END DO
  END SUBROUTINE matmul_test

> gfortran -c -fprofile-generate -O3 bug.f90
bug.f90:1:0:

   SUBROUTINE matmul_test ( ntim,len)
^
internal compiler error: in dfs_enumerate_from, at cfganal.c:1195
0x75b65d dfs_enumerate_from(basic_block_def*, int, bool (*)(basic_block_def
const*, void const*), basic_block_def**, int, void const*)
        ../../gcc/gcc/cfganal.c:1195
0xd93996 determine_bb_domination_status
        ../../gcc/gcc/tree-ssa-threadupdate.c:1769
0xd93996 thread_through_loop_header
        ../../gcc/gcc/tree-ssa-threadupdate.c:1953
0xd9549c thread_through_all_blocks(bool)
        ../../gcc/gcc/tree-ssa-threadupdate.c:2667
0xcc667b execute
        ../../gcc/gcc/tree-ssa-dom.c:1244
Please submit a full bug report,


gcc version 6.0.0 20150531 (experimental) [trunk revision 223896] (GCC)