s390x: yet another batch of intrinsics #1
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This is to combat the spurious CI failures in emulated run. Also helps with updatability and compatibility - it will work even if Intel changes the link
This commit fixes an issue where simd shift intrinsic in LLVM are undefined behavior if the shift amount is larger than the bit width of the lane. While in WebAssembly the corresponding instructions are defined as masking out the upper bits we need to represent that explicitly in LLVM IR to ensure that the semantics remain defined. cc rust-lang/rust#137941
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this has now been merged as rust-lang#1743 |
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builds on rust-lang#1738, which should be merged first.
This should be the final interesting batch. There are some missing functions, that can be implemented now but would really benefit from some LLVM changes. So we'll see about those.