Auto merge of #120718 - saethlin:reasonable-fast-math, r=nnethercote

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Add "algebraic" fast-math intrinsics, based on fast-math ops that cannot return poison

Setting all of LLVM's fast-math flags makes our fast-math intrinsics very dangerous, because some inputs are UB. This set of flags permits common algebraic transformations, but according to the [LangRef](https://llvm.org/docs/LangRef.html#fastmath), only the flags `nnan` (no nans) and `ninf` (no infs) can produce poison.

And this uses the algebraic float ops to fix https://github.com/rust-lang/rust/issues/120720

cc `@orlp`

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bors 2024-02-21 09:43:33 +00:00

parent 10e7c4e7d8 e858ce0524

commit 8c612ad48f

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