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| 2026-02-14 22:54:34 +0100 | caubert | (~caubert@user/caubert) caubert |
| 2026-02-14 22:48:14 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) (Ping timeout: 245 seconds) |
| 2026-02-14 22:43:27 +0100 | merijn | (~merijn@host-cl.cgnat-g.v4.dfn.nl) merijn |
| 2026-02-14 22:42:43 +0100 | <tomsmeding> | 99% certain they don't built on top of vector and allocate their own primitive arrays |
| 2026-02-14 22:40:56 +0100 | <[exa]> | probie: btw really try if repa manages to SIMD, deconstructing a working instance is a MUCH easier way to debug compilers than trying to hit a subtle trick that does it |
| 2026-02-14 22:40:50 +0100 | <int-e> | *led |
| 2026-02-14 22:40:44 +0100 | caubert | (~caubert@user/caubert) (Ping timeout: 245 seconds) |
| 2026-02-14 22:40:41 +0100 | <int-e> | It lead to `inlinePerformIO` being renamed :-) |
| 2026-02-14 22:40:12 +0100 | <int-e> | probie: Well, you have mutable data there; even lazy evaluation shouldn't accidentally alias those. (Though for people who remember the early days of bytestring... yes, these things have happened.) |
| 2026-02-14 22:39:05 +0100 | <tomsmeding> | it might be possible to devise something in combination with linear types |
| 2026-02-14 22:38:36 +0100 | <probie> | We need a new GHC extension that introduces the `restrict` keyword (although I can't imagine that being a sane thing to have in the context of non-strict evaluation) |
| 2026-02-14 22:38:03 +0100 | <int-e> | and it'll get awkward regardless if the relative alignment of the two pointers isn't 0. |
| 2026-02-14 22:37:24 +0100 | <[exa]> | oh yes true |
| 2026-02-14 22:37:11 +0100 | <tomsmeding> | [exa]: remember this is a loop with dependencies so llvm can't unroll |
| 2026-02-14 22:37:01 +0100 | <int-e> | And I don't think you can express the promise that these two pointers never alias at the Haskell level. |
| 2026-02-14 22:36:54 +0100 | <[exa]> | is it? (does the vector start on aligned addr?) |
| 2026-02-14 22:36:17 +0100 | <tomsmeding> | ah yes, in this case it is |
| 2026-02-14 22:36:01 +0100 | <int-e> | tomsmeding: well, the alignment is already fixed by how you unrolled the loop |
| 2026-02-14 22:36:00 +0100 | <[exa]> | like, ofc llvm is going to brainify that to The Way Better Aligned Load |
| 2026-02-14 22:35:40 +0100 | <tomsmeding> | I'm... not sure what I was thinking |