https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71292
--- Comment #1 from kugan at gcc dot gnu.org ---
(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
