diff options
Diffstat (limited to 'gcc/cfgexpand.c')
| -rw-r--r-- | gcc/cfgexpand.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/gcc/cfgexpand.c b/gcc/cfgexpand.c index 059c5b2..ebe0a03 100644 --- a/gcc/cfgexpand.c +++ b/gcc/cfgexpand.c @@ -3171,7 +3171,31 @@ expand_debug_expr (tree exp) int part = var_to_partition (SA.map, exp); if (part == NO_PARTITION) - return NULL; + { + /* If this is a reference to an incoming value of parameter + that is never used in the code or where the incoming + value is never used in the code, use PARM_DECL's + DECL_RTL if set. */ + if (SSA_NAME_IS_DEFAULT_DEF (exp) + && TREE_CODE (SSA_NAME_VAR (exp)) == PARM_DECL) + { + rtx incoming = DECL_INCOMING_RTL (SSA_NAME_VAR (exp)); + if (incoming + && GET_MODE (incoming) != BLKmode + && (REG_P (incoming) + || (MEM_P (incoming) && REG_P (XEXP (incoming, 0))))) + { + op0 = gen_rtx_ENTRY_VALUE (GET_MODE (incoming)); + ENTRY_VALUE_EXP (op0) = incoming; + goto adjust_mode; + } + op0 = expand_debug_expr (SSA_NAME_VAR (exp)); + if (!op0) + return NULL; + goto adjust_mode; + } + return NULL; + } gcc_assert (part >= 0 && (unsigned)part < SA.map->num_partitions); |