[Bug sanitizer/63520] ICE: in get_biv_step, at loop-iv.c:824 with -fsanitize=undefined on ppc64

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63520

--- Comment #8 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #7)
> That backtrace is not related to what happened at all, the thing is just
> that cc1plus ICEd and the gcc driver decided (incorrectly) to emit backtrace
> for where it caught the signal.  You really need to attach debugger to the
> segfaulting cc1plus to see where it crashed.

OK.

process 16131 is executing new program:
/home/trippels/gcc_build_dir/prev-gcc/cc1plus

Program received signal SIGSEGV, Segmentation fault.
[Switching to process 16131]
0x0000000010ce6ac8 in
wi::fits_to_tree_p<generic_wide_int<wide_int_ref_storage<false> > > (x=...,
type=0x3fffac28fd50) at ../../gcc/gcc/tree.h:4757
4757    wi::fits_to_tree_p (const T &x, const_tree type)
(gdb) bt
#0  0x0000000010ce6ac8 in
wi::fits_to_tree_p<generic_wide_int<wide_int_ref_storage<false> > > (x=...,
type=0x3fffac28fd50) at ../../gcc/gcc/tree.h:4757
#1  0x0000000010cd6bc0 in force_fit_type (type=0x3fffac28fd50, cst=...,
overflowable=<optimized out>, overflowed=<optimized out>) at
../../gcc/gcc/tree.c:1237
#2  0x0000000010656da0 in fold_negate_const (arg0=arg0@entry=0x3fffa4d90c78,
type=type@entry=0x3fffac28fd50) at ../../gcc/gcc/fold-const.c:15423
#3  0x000000001068d50c in fold_negate_expr (loc=loc@entry=0,
t=t@entry=0x3fffa4d90c78) at ../../gcc/gcc/fold-const.c:555
#4  0x000000001068f0d8 in negate_expr (t=0x3fffa4d90c78) at
../../gcc/gcc/fold-const.c:775
#5  0x000000001066bbfc in fold_binary_loc (loc=loc@entry=0,
code=code@entry=MINUS_EXPR, type=type@entry=0x3fffac28fd50,
op0=op0@entry=0x3fffa56ccbc0,
    op1=op1@entry=0x3fffa4d90c78) at ../../gcc/gcc/fold-const.c:10450
#6  0x000000001067d918 in fold_build2_stat_loc (loc=<optimized out>,
code=<optimized out>, type=0x3fffac28fd50, op0=0x3fffa56ccbc0,
op1=0x3fffa4d90c78)
    at ../../gcc/gcc/fold-const.c:14231
#7  0x0000000010735418 in generic_simplify (loc=<optimized out>,
code=<optimized out>, type=0x3fffac28fd50, op0=0x3fffa56ccb80, op1=<optimized
out>) at generic-match.c:3194
#8  0x0000000010668164 in fold_binary_loc (loc=loc@entry=0,
code=code@entry=PLUS_EXPR, type=type@entry=0x3fffac28fd50,
op0=op0@entry=0x3fffa56ccb80,
    op1=op1@entry=0x3fffa56ccba0) at ../../gcc/gcc/fold-const.c:9729