<emeb_mac>
So I spent some time fiddling around with building latest yosys on rpi4. No idea why clang wouldn't build it, but it always crashed on the very first file - even when I #ifdefed the entire contents of the file.
<emeb_mac>
I tweaked the makefile to use gcc instead of clang and it appears to be building just fine though
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<corecode>
clang crashed?
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<ZirconiumX>
daveshah: For $mul mapping, is it better to map $macc or use mul2dsp?
<daveshah>
ZirconiumX: definitely mul2dsp
<daveshah>
$macc is a pretty nasty cell for internal mapping only imo
<ZirconiumX>
So, the Cyclone V has variable-width multipliers; you can set them to be 9x9, 18x18 or 27x27
<ZirconiumX>
But mul2dsp seems to assume only a single size of multiplier.
<daveshah>
That would need changing
<daveshah>
You could probably map to an intermediate cell of the largest size and then down map as appropriate to start with
<daveshah>
But the decomposition might need work to optimally use the smaller multipliers
<ZirconiumX>
Worth filling a bug as a feature request?
<daveshah>
Sure
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