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FYL2XP1 Y * Log2(X+1) Exception Flags: P
FYL2XP1
Logic: T1 . ST + 1
T2 . ST(1) * Log2(T1)
pop stack
ST . T2
FYL2XP1 calculates Y * Log2(X+1). X comes from ST and Y from ST(1).
The instruction pops the stack, leaving the result in ST.
The numbers must be in the following ranges:
0 < |X| < (1 - .2/2) -. < Y < +.
--------------------------------------------------------------------------
Operands Clocks Bytes Example
FYL2XP1 700-1000 3 FYL2XP1
--------------------------------------------------------------------------
Note: Use this instruction for more accuracy than FYL2X
when calculating the log of a number close to 1.
See Also:
FYL2X
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