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[FPEnv] Intrinsics for access to FP control modes
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Authored by sepavloff on Jun 25 2020, 1:30 AM.

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Summary

The change implements intrinsics 'get_fpmode', 'set_fpmode' and 'reset_fpmode'.
They do the same operations as C library functions 'fegetmode' and 'fesetmode'.
By default the intrinsics are lowered to calls to these library functions.

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