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rtlil: Adjust internal check for `$mem_v2` cells 

There's a mismatch between what `kernel/mem.cc` emits for memories
with no read ports and what the internal RTLIL check expects.

The point of dispute it whether some of the parameters relating to read
ports have a zero-width value in this case. The `mem.cc` code says no,
the internal checker says yes.

Surveying the other `$mem_v2` parameters, and internal cell parameters
in general, I am inclined to side with the `mem.cc` code.

This breaks RTLIL compatibility but for an obscure edge case.
This commit is contained in:
Martin Povišer 2024-11-08 15:18:14 +01:00
parent 8c2d1a16d0
commit e82e5f8b13
2 changed files with 12 additions and 3 deletions
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6
kernel/rtlil.cc
View File

@ -1856,9 +1856,9 @@ namespace {
param_bits(ID::RD_COLLISION_X_MASK, max(1, param(ID::RD_PORTS) * param(ID::WR_PORTS)));
param_bits(ID::RD_WIDE_CONTINUATION, max(1, param(ID::RD_PORTS)));
param_bits(ID::RD_CE_OVER_SRST, max(1, param(ID::RD_PORTS)));
param_bits(ID::RD_ARST_VALUE, param(ID::RD_PORTS) * param(ID::WIDTH));
param_bits(ID::RD_SRST_VALUE, param(ID::RD_PORTS) * param(ID::WIDTH));
param_bits(ID::RD_INIT_VALUE, param(ID::RD_PORTS) * param(ID::WIDTH));
param_bits(ID::RD_ARST_VALUE, max(1, param(ID::RD_PORTS) * param(ID::WIDTH)));
param_bits(ID::RD_SRST_VALUE, max(1, param(ID::RD_PORTS) * param(ID::WIDTH)));
param_bits(ID::RD_INIT_VALUE, max(1, param(ID::RD_PORTS) * param(ID::WIDTH)));
param_bits(ID::WR_CLK_ENABLE, max(1, param(ID::WR_PORTS)));
param_bits(ID::WR_CLK_POLARITY, max(1, param(ID::WR_PORTS)));
param_bits(ID::WR_WIDE_CONTINUATION, max(1, param(ID::WR_PORTS)));

9
tests/memories/nordports.ys Normal file
View File

@ -0,0 +1,9 @@
# check memory_collect doesn't produce invalid RTLIL on a memory w/o read ports
read_rtlil <<EOF
autoidx 1
attribute \top 1
module \top
memory width 4 size 3 \foo
end
EOF
memory_collect