smull

Signed Multiply Long (Thumb)

SMULL <RdLo>, <RdHi>, <Rn>, <Rm>

Signed Multiply (64-bit result).

Details

The Signed Multiply Long instruction signed Multiply (64-bit result).

Pseudocode Operation

RdLo ← RdHi × Rn

Example

SMULL r1, r0, r1, r2

Encoding

Binary Layout
111110111000
Rn
RdLo
RdHi
0000
Rm
 
Format Thumb Mul
Opcode 0xFB800000
Extension A32 (Base)

Operands

  • RdLo
    Low
  • RdHi
    High
  • Rn
    First source / base general-purpose register
  • Rm
    Second source / offset general-purpose register