https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77678
Bug ID: 77678
Summary: ICE in fold_read_from_constant_string, at
fold-const.c:13706
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: gerhard.steinmetz.fort...@t-online.de
Target Milestone: ---
A problem with default initialization (used for testing only),
starting at a specific negative value.
For versions down to at least 4.8, at -Og, -Os, -O1 or higher.
Testcode with an uninitialized variable "i" :
$ cat z1.f90
program p
character(1) :: z
integer :: i
! i = 2
z = 'abc'(i:i)
print *, z
end
$ gfortran-7-20160918 -O2 -finit-integer=-1 z1.f90
$ gfortran-7-20160918 -O2 -finit-integer=-8900000 z1.f90
$ gfortran-7-20160918 -O2 -finit-integer=-12345678 z1.f90
z1.f90:7:0:
end
internal compiler error: Segmentation fault
0xc21a5f crash_signal
../../gcc/toplev.c:336
0x951f1b fold_read_from_constant_string(tree_node*)
../../gcc/fold-const.c:13706
0x996f7f fold_const_aggregate_ref_1(tree_node*, tree_node* (*)(tree_node*))
../../gcc/gimple-fold.c:5754
0x9984de fold_const_aggregate_ref(tree_node*)
../../gcc/gimple-fold.c:5857
0x9984de maybe_fold_reference
../../gcc/gimple-fold.c:281
0x998999 fold_gimple_assign
../../gcc/gimple-fold.c:313
0x99ddff fold_stmt_1
../../gcc/gimple-fold.c:3901
0xdc0781 substitute_and_fold_dom_walker::before_dom_children(basic_block_def*)
../../gcc/tree-ssa-propagate.c:1111
0x1299da2 dom_walker::walk(basic_block_def*)
../../gcc/domwalk.c:265
0xdbfb9b substitute_and_fold(tree_node* (*)(tree_node*), bool
(*)(gimple_stmt_iterator*), bool)
../../gcc/tree-ssa-propagate.c:1211
0xd299cc ccp_finalize
../../gcc/tree-ssa-ccp.c:949
0xd299cc do_ssa_ccp
../../gcc/tree-ssa-ccp.c:2415
0xd299cc execute
../../gcc/tree-ssa-ccp.c:2458
