diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index ae06307bca9..2686294bfd8 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -5514,11 +5514,23 @@ loop_givs_rescan (struct loop *loop, struct iv_class *bl, rtx *reg_map) rtx reg, seq; start_sequence (); reg = force_reg (v->mode, *v->location); - seq = get_insns (); - end_sequence (); - loop_insn_emit_before (loop, 0, v->insn, seq); - if (!validate_change_maybe_volatile (v->insn, v->location, reg)) - gcc_unreachable (); + if (validate_change_maybe_volatile (v->insn, v->location, reg)) + { + seq = get_insns (); + end_sequence (); + loop_insn_emit_before (loop, 0, v->insn, seq); + } + else + { + end_sequence (); + if (loop_dump_stream) + fprintf (loop_dump_stream, + "unable to reduce iv in insn %d\n", + INSN_UID (v->insn)); + bl->all_reduced = 0; + v->ignore = 1; + continue; + } } } else if (v->replaceable) |