n64: implement undocumented accesses in FPU half-mode #1364
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As documented on the n64brew wiki and tested via n64-systemtest. This commit fixes most of the remaining failures.
The current hack to check for FPU exceptions has been defeated by recent versions of clang. Add a volatile keyword in the mix, which seems to help (for now).
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Fixes most of the remaining failures in n64-systemtest