riscv64: Add SIMD avg_round
#6599
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afonso360
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👋 Hey,
This PR implements the SIMD
avg_roundinstruction. We don't have a native version of this, so we break it down into multiple ops, using a slightly modified formula from Hacker's Delight.The original formula does a floor average round, but we correct that by using a special shift right instruction that rounds up the result. I think this is correct, but would appreciate a double check on it.
This passes both the cranelift tests, as well as the wasmtime
*_arith2test suites, however we can't enable them yet because they also requireiabswhich is only implemented in #6598.