[RyuJit/WASM] Establish SP & FP and home register arguments #123270
+137
−8
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I've decided to do a bespoke function for WASM, mainly due to the awkwardness of porting the register mask code that would be of questionable value. Instead, we place an allocation constraint on the RA.
With these changes, we are very close to getting a functional "add(x, y)". The only remaining part is the SP arg, being worked on in #123262.