diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/ssa.c | 22 |
2 files changed, 20 insertions, 7 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5c64550..9ff0f27 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2002-05-29 Chris Lattner <sabre@nondot.org> + + * ssa.c (rename_insn_1): Rename uses of undefined registers to + prevent confusion if/when the register is defined. + 2002-05-29 Hans-Peter Nilsson <hp@axis.com> PR target/6838 @@ -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; |