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[simd] Resolve LWG4420 and LWG4393 #8353

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[simd] Resolve LWG4420 and LWG4393 #8353

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@mattkretz
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This provides the proposed resolution to LWG4420, which then also resolves LWG4393.

@jensmaurer jensmaurer added lwg Issue must be reviewed by LWG. not-editorial Issue is not deemed editorial; the editorial issue is kept open for tracking. labels Oct 21, 2025
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jensmaurer commented Oct 21, 2025 •
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This pull request has nothing to do with the current proposed resolution on the mentioned LWG issues.
Also, where did the "output_range" constraint go that would address LWG4393?
And please use the correct git commit title per https://github.com/cplusplus/draft/wiki/Commit-message-format .
And we probably have an overfull \hbox or so; the CI build is failing.

@jensmaurer jensmaurer added the changes requested Changes to the wording or approach have been requested and not yet applied. label Oct 21, 2025
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Sorry @jensmaurer, I did not expect a review as long as the PR is in draft status.
I just sent a big update to LWG4420 and wanted to point to a PR from it, which is why I opened it here. I'll fix the hboxes and commit message.

@mattkretz
LWG4420 [simd] conversions (constructor, load, stores, gather, and sc…
c081cf4 
…atter) are incorrectly constrained for <stdfloat> types

Also fixes LWG4393, NB DE-288 (C++26 CD), NB DE-285 (C++26 CD).
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changes requested Changes to the wording or approach have been requested and not yet applied. lwg Issue must be reviewed by LWG. not-editorial Issue is not deemed editorial; the editorial issue is kept open for tracking.

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