Signed Most significant word Multiply with Accumulation.
is an optional parameter. If R is present, the result is rounded, otherwise it is truncated.
is an optional condition code.
is the destination register.
- Rn, Rm
are the registers holding the operands.
is a register holding the value to be added or subtracted from.
SMMLA multiplies the values from
Rm, adds the value in
Ra to the most significant 32 bits of the product, and
stores the result in
If the optional R parameter is specified,
added before extracting the most significant 32 bits. This has the
effect of rounding the result.
You cannot use PC for any register.
You can use SP in ARM instructions but this is deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.
This instruction does not change the flags.
This ARM instruction is available in ARMv6 and above.
This 32-bit Thumb instruction is available in ARMv6T2 and above. For the ARMv7-M architecture, it is only available in an ARMv7E-M implementation.
There is no 16-bit version of this instruction in Thumb.