MNEG
Multiply-Negate multiplies two register values, negates the product, and writes the result to the destination register.
This is an alias of MSUB. This means:
- The encodings in this description are named to match the encodings of MSUB.
- The description of MSUB gives the operational pseudocode for this instruction.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| sf | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | Rm | 1 | 1 | 1 | 1 | 1 | 1 | Rn | Rd | ||||||||||||
| o0 | Ra | ||||||||||||||||||||||||||||||
32-bit (sf == 0)
is equivalent to
and is always the preferred disassembly.
64-bit (sf == 1)
is equivalent to
and is always the preferred disassembly.
Assembler Symbols
| <Wd> |
Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Wn> |
Is the 32-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field. |
| <Wm> |
Is the 32-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field. |
| <Xd> |
Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. |
| <Xn> |
Is the 64-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field. |
| <Xm> |
Is the 64-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field. |
Operation
The description of MSUB gives the operational pseudocode for this instruction.
Operational information
If PSTATE.DIT is 1:
- The execution time of this instruction is independent of:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.
- The response of this instruction to asynchronous exceptions does not vary based on:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.