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| author | Clifford Wolf <clifford@clifford.at> | 2014-08-30 14:43:06 +0200 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2014-08-30 14:43:06 +0200 |
| commit | 3a7d5d188d4b9cfeb225e0f5dea07ee7a40eceed (patch) | |
| tree | 21ae31ab348b710986149d74ee5bd60544b3a6f6 /passes/fsm | |
| parent | f910481f35109d7333088ac79bb25729e516fa00 (diff) | |
| download | yosys-3a7d5d188d4b9cfeb225e0f5dea07ee7a40eceed.tar.gz yosys-3a7d5d188d4b9cfeb225e0f5dea07ee7a40eceed.tar.bz2 yosys-3a7d5d188d4b9cfeb225e0f5dea07ee7a40eceed.zip | |
Don't change existing binary FSM encoding if it is already optimal
Diffstat (limited to 'passes/fsm')
| -rw-r--r-- | passes/fsm/fsm_recode.cc | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/passes/fsm/fsm_recode.cc b/passes/fsm/fsm_recode.cc index 9c0da0a37..ea10cdf80 100644 --- a/passes/fsm/fsm_recode.cc +++ b/passes/fsm/fsm_recode.cc @@ -82,7 +82,12 @@ static void fsm_recode(RTLIL::Cell *cell, RTLIL::Module *module, FILE *fm_set_fs fsm_data.state_bits = fsm_data.state_table.size(); } else if (encoding == "binary") { - fsm_data.state_bits = ceil(log2(fsm_data.state_table.size())); + int new_num_state_bits = ceil(log2(fsm_data.state_table.size())); + if (fsm_data.state_bits == new_num_state_bits) { + log(" existing encoding is already a packed binary encoding.\n"); + return; + } + fsm_data.state_bits = new_num_state_bits; } else log_error("FSM encoding `%s' is not supported!\n", encoding.c_str()); |