diff options
Diffstat (limited to 'gcc/cselib.cc')
| -rw-r--r-- | gcc/cselib.cc | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/cselib.cc b/gcc/cselib.cc index 6a56097..9b582e5 100644 --- a/gcc/cselib.cc +++ b/gcc/cselib.cc @@ -1569,6 +1569,26 @@ new_cselib_val (unsigned int hash, machine_mode mode, rtx x) e->locs = 0; e->next_containing_mem = 0; + scalar_int_mode int_mode; + if (REG_P (x) && is_int_mode (mode, &int_mode) + && REG_VALUES (REGNO (x)) != NULL + && (!cselib_current_insn || !DEBUG_INSN_P (cselib_current_insn))) + { + rtx copy = shallow_copy_rtx (x); + scalar_int_mode narrow_mode_iter; + FOR_EACH_MODE_UNTIL (narrow_mode_iter, int_mode) + { + PUT_MODE_RAW (copy, narrow_mode_iter); + cselib_val *v = cselib_lookup (copy, narrow_mode_iter, 0, VOIDmode); + if (v) + { + rtx sub = lowpart_subreg (narrow_mode_iter, e->val_rtx, int_mode); + if (sub) + new_elt_loc_list (v, sub); + } + } + } + if (dump_file && (dump_flags & TDF_CSELIB)) { fprintf (dump_file, "cselib value %u:%u ", e->uid, hash); |