diff options
Diffstat (limited to 'gcc/ssa.c')
| -rw-r--r-- | gcc/ssa.c | 22 |
1 files changed, 15 insertions, 7 deletions
@@ -916,18 +916,26 @@ rename_insn_1 (ptr, data) } case REG: - if (CONVERT_REGISTER_TO_SSA_P (REGNO (x)) && - REGNO (x) < ssa_max_reg_num) + if (CONVERT_REGISTER_TO_SSA_P (REGNO (x)) + && REGNO (x) < ssa_max_reg_num) { rtx new_reg = ssa_rename_to_lookup (x); - if (new_reg != NULL_RTX && new_reg != RENAME_NO_RTX) + if (new_reg != RENAME_NO_RTX) { - if (GET_MODE (x) != GET_MODE (new_reg)) - abort (); - *ptr = new_reg; + if (new_reg != NULL_RTX) + { + if (GET_MODE (x) != GET_MODE (new_reg)) + abort (); + *ptr = new_reg; + } + else + { + /* Undefined value used, rename it to a new pseudo register so + that it cannot conflict with an existing register */ + *ptr = gen_reg_rtx (GET_MODE(x)); + } } - /* Else this is a use before a set. Warn? */ } return -1; |