Rollup merge of #157831 - folkertdev:carryless-mul-test, r=nikic test `carryless_mul` codegen tracking issue: https://github.com/rust-lang/rust/issues/152080 Test the codegen of `carryless_mul` with LLVM 23, which has custom lowerings for x86_64, aarch64 and riscv64. - Rust to LLVM IR: https://godbolt.org/z/sM914e4fo - LLVM IR to assembly: https://godbolt.org/z/5Y7naa4cY You can also see that the default expansion (when there is no special intruction available) is quite large still... - manual https://godbolt.org/z/hbEe3WMdW (based on https://github.com/rust-lang/rust/pull/152132#discussion_r2772245464) - LLVM https://godbolt.org/z/577Wb9E99 So LLVM default over 3X the number of instructions for the 64-bit and 128-bit case.
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