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)
