Tuesday, 2023-04-04

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loftyso-offish: TRELLIS_COMB is a LUT4, or half a CCU2C, or a quarter of a TRELLIS_DPR16X400:07
so-offishlofty: Yeah but I need fixed routing; I need to be able to tell the tool "No really: This TRELLIS_COMB, right here"00:12
so-offishlofty: I was kinda using TRELLIS_SLICE to get around the packer.00:13
so-offishlofty: tnt: Thank you both for your help today. Gotta sign off; I'll bbl.00:13
loftyso-offish: the tool for that has always been the BEL attribute in nextpnr.00:31
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datenwolf... *ooff*, I'm getting major Qt related PTSD flashbacks with regard to this exception in the UI code (one of my previous projects sufferd from similar issues after a Qt version bump)08:37
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so-offishlofty: saw your answer yesterday about the BEL attribute (rather than using TRELLIS_SLICE directly); thank you. :)16:39
datenwolfidentified the bug. Locales do strike once again... and here NextPNR is yet another example why stringly typed values are harmful. gui/worker.cc uses std::to_string to convert numerics into property strings (to_string does conversion with locale), timing.cc assign_budget will then retrieve those settings through Context::setting<T> which internally uses boost::lexical_cast<T> that for some reason18:10
datenwolfwon't use the same locale, as std::to_string. Recommended workaround: On GUI startup nuke the locale and force it to C18:10
* datenwolf chuckles on the thought, that he's haunted by locale induced numeric<->string roundtrip conversion bugs. first_time_questionmark.gif18:12
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so-offishok everyone: who is super pumped to help me get setup to help debug this qt issue in nextpnr21:57
so-offishThat came out more mangled than I intended.21:57
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so-offishdatenwolf: which bug?23:28
so-offishdatenwolf: The one I reported earlier?23:29

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