#dri-devel on 2025-02-22 — irc logs at oftc.irclog.whitequark.org

2024-07-16 04:52 ChanServ changed the topic of #dri-devel to: <ajax> nothing involved with X should ever be unable to find a bar

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00:10 <gfxstrand> Feel free to file a bug on github.com/KhronosGroup/Vulkan-Docs and someone might take it up.

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00:49 <anarsoul> does anyone besides alyssa have comments on https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33331 ?

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11:05 <gio> I'm trying to debug a llvmpipe crash. Playing a little bit with NIR_DEBUG I noticed that the program crashes even earlier if I enable NIR_DEBUG=extended_validation, complaining that return instruction is unsupported in the divergence analysis algorithm. Is that something I should worry about? I.e., is the divergence analysis pass something that should work anyway and if it doesn't

11:05 <gio> it means I have already hit a problem, or is it something that usually should just be ignored and it's failing just because I forcibly pulled that in with "extended_validation"?

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11:29 <pendingchaos> that's probably an issue with NIR_DEBUG=extended_validation

11:29 <pendingchaos> you can just replace "nir_metadata_all" with "nir_metadata_all & ~nir_metadata_divergence" in "nir_metadata_require_all"

11:29 <pendingchaos> NIR_DEBUG=extended_validation probably wouldn't be helpful for debugging a crash, it's more useful for finding theoretical issues

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12:35 <glehmann> it would probably be a good idea to support all intrinsics in divergence analysis though, I think llvmpipe is already using divergence analysis: https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32963/diffs?commit_id=a57e8b2e97205cc2bff752fa2fc377f6f48d931f

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12:57 <ishitatsuyuki> building mesa after ages, any idea why I'm getting this?

12:57 <ishitatsuyuki> mold: error: duplicate symbol: src/c11/impl/libmesa_util_c11.a(src/c11/impl/libmesa_util_c11.a.p/threads_posix.c.o): /usr/lib/libc.so.6: call_once

12:59 <ishitatsuyuki> guess i'm just going to be lazy and patch with_c11_threads = true to be always true

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13:35 <gio> pendingchaos: Got it, thanks!

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15:03 <gio> Since the crash I am looking at happens in lp_bld_nir_soa.c, is there any high level description of what that file is supposed to do? What does SOA stand for?

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15:31 <glehmann> gio: that file converts NIR to llvm IR. SOA means struct of array. compare with lp_bld_nir_aos which is a special fast path using array of struct.

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15:39 <gio> Ok, thanks!

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