/* Set the FPU control word.
Copyright (C) 1996-2014 Free Software Foundation, Inc.
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__setfpucw (fpu_control_t set)
/* Fetch the current control word. */
/* Preserve the reserved bits, and set the rest as the user
specified (or the default, if the user gave zero). */
cw &= _FPU_RESERVED;
cw |= set & ~_FPU_RESERVED;