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Billy Laws
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See https://learn.microsoft.com/en-us/cpp/build/arm64ec-windows-abi-conventions?view=msvc-170 note that since mm registers are volatile there is no need to match the mapping for them when in JIT, so they can be used as scratch regs. Disallowed regs are also wiped on context switches, so they cannot be taken advantage of to e.g. avoid spilling.