ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Assembler syntax
SMLAL , , ,
where:
Instruction Details
Specifies which half of the source register is used as the first multiply operand. If
is B, then the bottom half (bits [15:0]) of is used. If is T, then the top half
(bits [31:16]) of is used.
Specifies which half of the source register is used as the second multiply operand. If
is B, then the bottom half (bits [15:0]) of is used. If is T, then the top half
(bits [31:16]) of is used.
See Standard assembler syntax fields on page A8-7.
Supplies the lower 32 bits of the accumulate value, and is the destination register for the
lower 32 bits of the result.
Supplies the upper 32 bits of the accumulate value, and is the destination register for the
upper 32 bits of the result.
The source register whose bottom or top half (selected by ) is the first multiply operand.
The source register whose bottom or top half (selected by ) is the second multiply
operand.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
operand1 = if n_high then R[n] else R[n];
operand2 = if m_high then R[m] else R[m];
result = SInt(operand1) * SInt(operand2) + SInt(R[dHi]:R[dLo]);
R[dHi] = result;
R[dLo] = result;
Exceptions
None.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-337