Michael Munday 6ab83122ac Fix storeEnumTagSinglePayload on big-endian systems ...

The part of the tag stored in the payload can currently be up to
8 bytes in size (though only the 'low' 4 bytes can be non-zero).
On little-endian machines this doesn't matter, we can always just
store up to 4 bytes and zero the remaining payload bytes. On big-
endian systems however we may need to store more than 4 bytes.

The store implementation now mirrors the runtime code that fetches
the tag on big-endian systems which already treats the payload tag
as an 8 byte integer.

This is a spot fix but longer term we might want to consider
refactoring this code to reduce the number of differences between
big- and little-endian implementations. For example, we could
centralise some of the copying logic and/or make the payload tag
a 4 byte field on all platforms.

2019-01-29 08:11:04 -05:00

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