On Tue, 24 Mar 2020, Martin Liška wrote:
> Hi.
>
> This patch caused:
>
> gcc
> /home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/990625-2.c
> -O3 -g -fno-tree-dce -c
> during GIMPLE pass: ifcvt
> /home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/990625-2.c:
> In function ‘broken030599’:
> /home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/compile/990625-2.c:2:1:
> internal compiler error: Segmentation fault
> 2 | broken030599(int *n)
> | ^~~~~~~~~~~~
> 0xe32f1f crash_signal
> ../../gcc/toplev.c:328
> 0x7ffff7999f1f ???
>
> /usr/src/debug/glibc-2.31-3.1.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
> 0x104ffe5 verify_use
> ../../gcc/tree-ssa.c:884
> 0x1054607 verify_ssa(bool, bool)
> ../../gcc/tree-ssa.c:1161
> 0xd4fb05 execute_function_todo
> ../../gcc/passes.c:1992
> 0xd507ae execute_todo
> ../../gcc/passes.c:2039
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
Likely
/* Delete dead statements. */
gsi = gsi_start_bb (bb);
while (!gsi_end_p (gsi))
{
needs to instead work back-to-front for debug stmt adjustment to work
