--- Log opened Mon Nov 13 00:00:24 2023
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06:39 < sipa> If possible, I'd like to get some review on #1058 now... the math is similar (but easier) than #1184, it gives a >10% speedup for keygen/signing, and is otherwise mostly a bunch of build system changes
06:52 < bitcoin-git> [secp256k1] fanquake opened pull request #1441: asm: add .note.GNU-stack section for non-exec stack (master...avoid_exec_stack_ld) https://github.com/bitcoin-core/secp256k1/pull/1441
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10:32 < real_or_random> sipa: hm jonas and I will be pretty busy this week, and he's out next week. I'll see what I can do next week but perhaps stratospher or theStack are available, given they have looked also at 1184   
10:33 < real_or_random> (good to hear that the math is easier than 1184, I thought it's harder...)
10:38 < sipa> no endomorphism :)
10:44 < real_or_random> aha
10:44 < real_or_random> ok, makes sense :)
10:45 < sipa> in theory the endomorphism could be used there too, but because it's in a precomputation setting, doing so doesn't reduce the number of doublings to perform
10:46 < sipa> so it'd just be a table size reduction, for a bit of extra CPU to apply the endomorphism
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14:34 < roconnor> sipa: Did you know that https://github.com/bitcoin-core/secp256k1/blob/master/src/field_5x52_int128_impl.h#L162 is signed instead of unsigned?
14:42 < roconnor> also I don't immediately see how to establish the 114 bit here: https://github.com/bitcoin-core/secp256k1/blob/master/src/field_5x52_int128_impl.h#L215
14:42 < roconnor> In the _mul_ version the corresponding check is 115 bits.
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14:43 < sipa> roconnor: i mean, i can read!
14:43 < roconnor> (keep in min that a4 was doubled in  https://github.com/bitcoin-core/secp256k1/blob/master/src/field_5x52_int128_impl.h#L192).
14:43 < sipa> int64_t certainly looks signed
14:43 < sipa> but i'm very surprised that there are any signed variabled in there
14:43 < roconnor> Just a bit odd that it is unsigned in the _mul_ version, and then you do bit shifting with the signed value.
14:47 < sipa> it appears to be a typo introduced here: https://github.com/bitcoin-core/secp256k1/commit/25b35c7ecb4419f3ca8cae0acf31a9ebe1d0a2e9#diff-35bbd3490af4fba588fa0e1cabfb6642d198e639170a6efc0b8dd5ee44d214b2R158
15:02 < roconnor> Everything else seems to check out other than that one VERIFY_BITS_128(&d, 114); on line 215.
15:02 < roconnor> I wonder if I can make that fail.
15:07 < roconnor> hmm, seem it might be true.
15:14 < roconnor> Okay I managed to establish the tigher bound.
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--- Log closed Tue Nov 14 00:00:25 2023