47b89fb412
We need the top bits to be zeroes, but an v8i8->i32 EXTRACT_VECTOR_ELT will anyext into the top bits. The instruction we create (UADDV) is known to be zeroes in the upper bits, so we can convert to a larger v2i32 vector and extract from there, similar to the operation currently performed for i64 types. Fixes #140707
The LLVM Compiler Infrastructure
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