# DRAFT List of 2-arg opcodes

These are A-Form, recommended Major Opcode 63 for full-width
and 59 for half-width (ending in s).

| 0.5|6.10|11.15|16.20| 21.25 | 26.30 |31| name          |  Form   |
| -- | -- | --- | --- | ----- | ----- |--| ----          | ------- |
| NN |FRT | FRA | FRB  | ///  | xxxxx |Rc| trigonometric | A-Form  |

As shown in Power ISA 3.0C Book III Appendix C Table 28 p1190
and Table 23 p1181,
Major Opcode 63 has room
for 9 A-Form 5-bit XO instructions, 00001, 01001, 01010, 01011,
01101, 10000, 10001, 10011, 11011.
Major Opcode 59 has 11 5-bit XO instructions,
00000, 00001, 00100, 00101, 00110, 00111,
10000, 10001, 10011, 10111, 11011.

| opcode    | Description            | Major 63                 | Major 59    |
| ------    | ----------------       | ----------------         | ----------- |
| FATAN2    | atan2 arc tangent      | 00001                    | 00001       |
| FATAN2PI  | atan2 arc tangent / pi | 01001                    | 00111       |
| FPOW      | x power of y           | 10000                    | 10000       |
| FPOWN     | x power of n (n int)   | 10001                    | 10001       |
| FPOWR     | x power of y (x +ve)   | 10011                    | 10011       |
| FROOTN    | x power 1/n (n integer)| 11011                    | 11011       |
| FHYPOT    | hypotenuse             | 10111                    | 01101       |
 
# DRAFT List of 1-arg transcendental opcodes

These are X-Form, and are identical in Special Register Altered to `fsqrt`

Special Registers Altered:

    FPRF FR FI FX OX UX XX
    VXSNAN VXIMZ VXZDZ
    CR1                    (if Rc=1)

| 0.5|6.10|11.15|16.20| 21..30      |31| name      |  Form   |
| -- | -- | --- | --- | ----------  |--| ----      | ------- |
| NN |FRT | /// | FRB  | xxxxx0111x |Rc| transcendental | X-Form  |

Recommended 10-bit XO with the low 5 LSBs 01110 and 01111:

| opcode   | Description              | Major 59 and 63 |
| ------    | ----------------       | ---------------- |
| FRSQRT   | Reciprocal Square-root   | 11110 01110     |
| FCBRT    | Cube Root                | 11111 01110     |
| FRECIP   | Reciprocal               | 11110 01111     |
| FEXP2    | power-of-2               | 00011 01110     |
| FLOG2    | log2                     | 00011 01111     |
| FEXPM1   | exponential minus 1      | 00101 01110     |
| FLOG1P   | log plus 1               | 00110 01110     |
| FEXP     | exponential              | 00111 01110     |
| FLOG     | natural log (base e)     | 00111 01111     |
| FEXP10   | power-of-10              | 11011 01110     |
| FLOG10   | log base 10              | 11011 01111     |

# DRAFT List of 1-arg trigonometric opcodes
 
These are X-Form, and are identical in Special Register Altered to `fsqrt`

Special Registers Altered:

    FPRF FR FI FX OX UX XX
    VXSNAN VXIMZ VXZDZ
    CR1                    (if Rc=1)

| 0.5|6.10|11.15|16.20| 21..30      |31| name      |  Form   |
| -- | -- | --- | --- | ----------  |--| ----      | ------- |
| NN |FRT | /// | FRB  | xxxxx0111x |Rc| trigonometric | X-Form  |

Recommended 10-bit XO with the low 5 LSBs 01110 and 01111:

| opcode      | Description              | Major 59 and 63 |
| ------    | ----------------       | ----------------   |
| FSIN        | sin (radians)            |  01000 01110   |
| FCOS        | cos (radians)            |  01001 01110    |
| FTAN        | tan (radians)            |  01011 01110    |
| FASIN       | arcsin (radians)         |  01100 01110    |
| FACOS       | arccos (radians)         |  01101 01110    |
| FATAN       | arctan (radians)         |  01111 01110    |
| FSINPI      | sin times pi             |  01000 01111    |
| FCOSPI      | cos times pi             |  01001 01111    |
| FTANPI      | tan times pi             |  01011 01111    |
| FASINPI     | arcsin / pi              |  01100 01111    |
| FACOSPI     | arccos / pi              |  01101 01111    |
| FATANPI     | arctan / pi              |  01111 01111    |
| FSINH       | hyperbolic sin (radians) |  10000 01110    |
| FCOSH       | hyperbolic cos (radians) |  10001 01110    |
| FTANH       | hyperbolic tan (radians) |  10011 01110    |
| FASINH      | inverse hyperbolic sin   |  10000 01111    |
| FACOSH      | inverse hyperbolic cos   |  10001 01111    |
| FATANH      | inverse hyperbolic tan   |  10011 01111    |