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(nasm.info)Section B.4.98

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B.4.98. `FSCALE': Scale Floating-Point Value by Power of Two
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     FSCALE                        ; D9 FD                [8086,FPU]

   `FSCALE' scales a number by a power of two: it rounds `ST1' towards
zero to obtain an integer, then multiplies `ST0' by two to the power of
that integer, and stores the result in `ST0'.