HFA and HVA Return Value ARM64 ABI documentation#969
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HFA and HVA values are returned in s0-s3, d0-d3 or v0-v3 registers depending on the size of the individual members of the HFA/HVA. For example a 4 member double type HFA is returned in d0-d3 with the first member returned in d0 and the 4th member returned in d3.
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HFA and HVA values are returned in s0-s3, d0-d3 or v0-v3 registers depending on the size of the individual members of the HFA/HVA. For example a 4 member double type HFA is returned in d0-d3 with the first member returned in d0 and the 4th member returned in d3.