diff options
Diffstat (limited to 'gcc/lra-constraints.c')
| -rw-r--r-- | gcc/lra-constraints.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/lra-constraints.c b/gcc/lra-constraints.c index a7de40b..bd5fbcd 100644 --- a/gcc/lra-constraints.c +++ b/gcc/lra-constraints.c @@ -5396,6 +5396,26 @@ split_reg (bool before_p, int original_regno, rtx_insn *insn, } return false; } + /* Split_if_necessary can split hard registers used as part of a + multi-register mode but splits each register individually. The + mode used for each independent register may not be supported + so reject the split. Splitting the wider mode should theoretically + be possible but is not implemented. */ + if (! HARD_REGNO_MODE_OK (hard_regno, mode)) + { + if (lra_dump_file != NULL) + { + fprintf (lra_dump_file, + " Rejecting split of %d(%s): unsuitable mode %s\n", + original_regno, + reg_class_names[lra_get_allocno_class (original_regno)], + GET_MODE_NAME (mode)); + fprintf + (lra_dump_file, + " ))))))))))))))))))))))))))))))))))))))))))))))))\n"); + } + return false; + } new_reg = lra_create_new_reg (mode, original_reg, rclass, "split"); reg_renumber[REGNO (new_reg)] = hard_regno; } |