DSP1/Inverse

Basic Info
Opcode	10
Speed	98 cycles 12.9 μs

Inverse is a DSP1 command that calculates a floating point multiplicative inverse (reciprocal).

Input Parameters

• a[M] is the coefficient
• b[C] is the exponent (in the range 8002h to 7FFFh)

The total input value is then a*2^b

Output Parameters

• A[M] is the coefficient
• B[C] is the exponent (in the range 8002h to 7FFFh)

The official documentation is missing the hexadecimal suffix "h" after 8002 for Inverse (see Note 3 on page 3-3-1).

References

• subparagraph 5.1.2 on page 3-5-2 of Book II of the official Super Nintendo development manual
• paragraph 6.2 on page 3-6-1 of Book II, lbid.
• https://github.com/bsnes-emu/bsnes/blob/master/bsnes/sfc/coprocessor/dsp1/dsp1emu.cpp#L305