https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71292
--- Comment #2 from kugan at gcc dot gnu.org ---
(In reply to kugan from comment #1)
> (In reply to ktkachov from comment #0)
> > An aarch64-none-linux-gnu bootstrap with an in-tree mpfr fails with an ICE:
> > exp_2.i: In function ‘fn1’:
> > exp_2.i:4:6: internal compiler error: Segmentation fault
> > void fn1() {
> > ^~~
> > 0xb1f8cf crash_signal
> > $SRC/gcc/toplev.c:333
> > 0x89bcb9 bb_seq_addr
> > $SRC/gcc/gimple.h:1655
> > 0x89bcb9 gsi_start_bb
> > $SRC/gcc/gimple-iterator.h:129
> > 0x89bcb9 gsi_for_stmt(gimple*)
> > $SRC/gcc/gimple-iterator.c:617
> > 0xcbbeba insert_stmt_after
> > $SRC/gcc/tree-ssa-reassoc.c:1323
> > 0xcbd67a build_and_add_sum
> > $SRC/gcc/tree-ssa-reassoc.c:1392
> > 0xcbf34f rewrite_expr_tree_parallel
> > $SRC/gcc/tree-ssa-reassoc.c:4128
> > 0xcc8b95 reassociate_bb
> > $SRC/gcc/tree-ssa-reassoc.c:5339
> > 0xcc8ad7 reassociate_bb
> > $SRC/gcc/tree-ssa-reassoc.c:5391
> > 0xccb523 do_reassoc
> > $SRC/gcc/tree-ssa-reassoc.c:5505
> > 0xccb523 execute_reassoc
> > $SRC/gcc/tree-ssa-reassoc.c:5592
> > 0xccb523 execute
> > $SRC/gcc/tree-ssa-reassoc.c:5631
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > Please include the complete backtrace with any bug report.
> > See <http://gcc.gnu.org/bugs.html> for instructions.
> >
> > The reduced testcase for that reproducible with trunk at:
> > gcc version 7.0.0 20160526
> > is:
> >
> > unsigned long a;
> > long b, d;
> > int c;
> > void fn1() {
> > unsigned long e = a + c;
> > b = d + e + a + 8;
> > }
> >
> > compile with -O2.
> > Compiling with -fno-tree-reassoc doesn't ICE
>
> It looks like dup of PR71252.
>
> does the patch at help?
> https://gcc.gnu.org/ml/gcc-patches/2016-05/msg02076.html
I can reproduce the error. With the patch from
https://gcc.gnu.org/ml/gcc-patches/2016-05/msg02076.html, I can bootstrap.
Please let me know if you still have any problem with the patch.
