#bitcoin-core-dev on 2022-01-23 — searchable irc log

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03:44 <bitcoin-git> [bitcoin] fanquake pushed 6 commits to master: https://github.com/bitcoin/bitcoin/compare/e3ce019667fb...6d859cbd794a

03:44 <bitcoin-git> bitcoin/master 9e64d69 John Newbery: [move] Move PoissonNextSend to src/random and update comment

03:44 <bitcoin-git> bitcoin/master 03cfa1b John Newbery: [refactor] Use uint64_t and std namespace in PoissonNextSend

03:44 <bitcoin-git> bitcoin/master bb06074 John Newbery: scripted-diff: replace PoissonNextSend with GetExponentialRand

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03:45 <bitcoin-git> [bitcoin] fanquake merged pull request #24021: Rename and move PoissonNextSend functions (master...202201_jnewbery_poisson_rename) https://github.com/bitcoin/bitcoin/pull/24021

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08:38 <bitcoin-git> [gui] w0xlt opened pull request #534: gui: add translatable address error message (master...2_error_message_addr) https://github.com/bitcoin-core/gui/pull/534

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13:16 <bitcoin-git> [bitcoin] hebasto opened pull request #24130: doc: Update the used Qt version (master...220123-deps) https://github.com/bitcoin/bitcoin/pull/24130

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14:16 <bitcoin-git> [bitcoin] hebasto opened pull request #24131: build, qt: Fix Windows cross-compiling with Qt 5.15 (master...220123-mingw) https://github.com/bitcoin/bitcoin/pull/24131

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15:10 <bitcoin-git> [bitcoin] hebasto opened pull request #24132: build: Bump minimum Qt version to 5.11.3 (master...220123-qtmin) https://github.com/bitcoin/bitcoin/pull/24132

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16:33 <bitcoin-git> [bitcoin] fjahr opened pull request #24133: index: Improve robustness of coinstatsindex at restart (master...2022-01-index-fixups) https://github.com/bitcoin/bitcoin/pull/24133

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18:04 <hebasto> sipa: can `__SHA__` macro be used to detect SHA extensions for CPU (at least for x86)? context -- https://stackoverflow.com/questions/21107350/how-can-i-access-sha-intrinsic

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18:26 <stick> hebasto: it doest not seem defined on my machine

18:28 <hebasto> stick: which compiler?

18:30 <stick> clang on darwin-arm64

18:31 <hebasto> that is pretty expected, maybe it is defined on x86?

18:32 <stick> ah, I thought, you were asking in context of https://github.com/bitcoin/bitcoin/pull/24115

18:36 <hebasto> stick: btw, started IBD test against the recent iteration of 24115

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19:14 <stick> hebasto: great! on which hardware? mac m1?

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19:35 <sipa> @hebasto I don't think that __SHA__ macro is useful for us.

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19:39 <hebasto> stick: yes, m1

19:39 <hebasto> sipa: ok

19:39 <stick> sipa: thanks for implementing 2-way transform!

19:40 <stick> btw, how does one decide whether 2-way, 4-way or even 8-way transform is possible/feasible?

19:41 <sipa> generally we assume that platforms for which a 2/4/8 way implementatioin exists, that it is also faster

19:43 <stick> yes, but in the case of PR 24115, the 2-way was ready yet, but you added it

19:43 <stick> is it possible to say before implementing it, whether spending time on writing 4-way transform is worth it?

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19:44 <sipa> ah, i didn't because there are only 16 simd registers

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19:46 <stick> i see, that makes sense; thanks for the explanation

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19:49 <sipa> and the code for one needs approximately 10, though some are only rarely needed

19:49 <sipa> but my guessis that doing 3 or more will create too much register pressure

19:50 <sipa> though i guess we could try

19:50 <sipa> it mostly depends on the latency and parallellism of the instructions, which may be platform dependent

19:50 <sipa> so on cortex-a53 i looked it up, and apparently most of the sha256 instructions have a latency of 6

19:50 <sipa> so more than 6-way parallellism definitely does not make sense

19:50 <sipa> but they also all need the same pipeline, so the bound is probably much lower

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23:34 <bitcoin-git> [bitcoin] hebasto opened pull request #24134: build: Fix zeromq package when cross-compiling (master...220123-zmq) https://github.com/bitcoin/bitcoin/pull/24134

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