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| 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. | 04:18 |
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| emeb_mac | I tweaked the makefile to use gcc instead of clang and it appears to be building just fine though | 04:18 |
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| corecode | clang crashed? | 08:16 |
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| ZirconiumX | daveshah: For $mul mapping, is it better to map $macc or use mul2dsp? | 12:32 |
| daveshah | ZirconiumX: definitely mul2dsp | 12:33 |
| daveshah | $macc is a pretty nasty cell for internal mapping only imo | 12:33 |
| ZirconiumX | So, the Cyclone V has variable-width multipliers; you can set them to be 9x9, 18x18 or 27x27 | 12:34 |
| ZirconiumX | But mul2dsp seems to assume only a single size of multiplier. | 12:35 |
| daveshah | That would need changing | 12:41 |
| daveshah | You could probably map to an intermediate cell of the largest size and then down map as appropriate to start with | 12:42 |
| daveshah | But the decomposition might need work to optimally use the smaller multipliers | 12:42 |
| ZirconiumX | Worth filling a bug as a feature request? | 12:48 |
| daveshah | Sure | 12:50 |
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