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| author | gatecat <gatecat@ds0.me> | 2021-05-14 23:13:30 +0100 |
|---|---|---|
| committer | gatecat <gatecat@ds0.me> | 2021-05-15 14:54:33 +0100 |
| commit | e1aaf715c6065c728e1dfe250ef419d1fc405553 (patch) | |
| tree | 4da6e2c4a59ef797f70b6bd0882a048ee7b4c416 /mistral | |
| parent | 87ebada258dbb6aa4bdf5552ed7a3dc85fcdf17c (diff) | |
| download | nextpnr-e1aaf715c6065c728e1dfe250ef419d1fc405553.tar.gz nextpnr-e1aaf715c6065c728e1dfe250ef419d1fc405553.tar.bz2 nextpnr-e1aaf715c6065c728e1dfe250ef419d1fc405553.zip | |
mistral: Compensate for EF_SEL mirroring in validity check
Signed-off-by: gatecat <gatecat@ds0.me>
Diffstat (limited to 'mistral')
| -rw-r--r-- | mistral/lab.cc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mistral/lab.cc b/mistral/lab.cc index 50ef7b11..838c72a3 100644 --- a/mistral/lab.cc +++ b/mistral/lab.cc @@ -384,8 +384,8 @@ bool Arch::is_alm_legal(uint32_t lab, uint8_t alm) const // signals and SLOAD=1 (*PKREF*) bool route_thru_lut_avail = !luts[i] && !carry_mode && (total_lut_inputs < 8) && (used_lut_bits < 64); // E/F is available if this LUT is using 3 or fewer inputs - this is conservative and sharing can probably - // improve this situation - bool ef_available = (!luts[i] || (luts[i]->combInfo.used_lut_input_count <= 2)); + // improve this situation. (1 - i) because the F input to EF_SEL is mirrored. + bool ef_available = (!luts[1 - i] || (luts[1 - i]->combInfo.used_lut_input_count <= 2)); // Control set checking bool found_ff = false; |