diff options
Diffstat (limited to 'gcc/fwprop.c')
| -rw-r--r-- | gcc/fwprop.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/fwprop.c b/gcc/fwprop.c index 7ac64aa..6e65093 100644 --- a/gcc/fwprop.c +++ b/gcc/fwprop.c @@ -228,7 +228,10 @@ single_def_use_enter_block (struct dom_walk_data *walk_data ATTRIBUTE_UNUSED, process_uses (df_get_artificial_uses (bb_index), DF_REF_AT_TOP); process_defs (df_get_artificial_defs (bb_index), DF_REF_AT_TOP); - df_simulate_initialize_forwards (bb, local_lr); + + /* We don't call df_simulate_initialize_forwards, as it may overestimate + the live registers if there are unused artificial defs. We prefer + liveness to be underestimated. */ FOR_BB_INSNS (bb, insn) if (INSN_P (insn)) |