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Merge pull request #4818 from povik/macc_v2

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Add `$macc_v2`
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Martin Povišer 2025-03-12 22:55:40 +01:00 • committed by GitHub
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18 changed files with 381 additions and 55 deletions
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2
docs/source/cell/word_arith.rst
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@ -1,7 +1,7 @@
Coarse arithmetics
------------------
.. todo:: Add information about `$alu`, `$fa`, and `$lcu` cells.
.. todo:: Add information about `$alu`, `$fa`, `$macc_v2`, and `$lcu` cells.
The `$macc` cell type represents a generalized multiply and accumulate
operation. The cell is purely combinational. It outputs the result of summing up

2
docs/source/code_examples/fifo/fifo.ys
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@ -67,7 +67,7 @@ show -color maroon3 @new_cells -notitle -format dot -prefix rdata_memrdv2 o:rdat
# ========================================================
alumacc
select -set new_cells t:$alu t:$macc
select -set new_cells t:$alu t:$macc_v2
show -color maroon3 @new_cells -notitle -format dot -prefix rdata_alumacc o:rdata %ci*
# ========================================================

2
docs/source/getting_started/example_synth.rst
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@ -523,7 +523,7 @@ That brings us to the fourth and final part for the iCE40 synthesis flow:
:name: synth_coarse4
Where before each type of arithmetic operation had its own cell, e.g. `$add`, we
now want to extract these into `$alu` and `$macc` cells which can help identify
now want to extract these into `$alu` and `$macc_v2` cells which can help identify
opportunities for reusing logic. We do this by running `alumacc`, which we can
see produce the following changes in our example design: