The floating point precision was always getting reset to :53-bit, even
if the user set a different value. Fix this so the correct precision is restored. compiler/x86/parms.lisp: o Add new static-symbol *FPU-PRECISION* to hold the precision bits that are given in (setf floating-point-modes). compiler/x86/float.lisp: o Whenever (setf floating-point-modes) is called, save the precision bits to *FPU-PRECISION* so that get restored correctly in DEALLOC-NUMBER-STACK-SPACE. compiler/x86/c-call.lisp: o Update DEALLOC-NUMBER-STACK-SPACE VOP so that when float-accuracy policy says so, we restore the precision from *fpu-precision*, instead of always making it :53-bit. code/lispinit.lisp: o Initialize the default precision to :53-bit on startup.
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