## ALP Programming Guide and Reference

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### Notes

If the operand in ST is negative, the invalid-operation exception is raised .

The FYL2X instruction is designed with a built-in multiplication to optimize the calculation of logarithms with arbitrary positive base:

logbx = (log2b) -1 * log2x

The instructions FLDL2T and FLDL2E load the constants log210 and log2e, respectively.