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

Assembler syntax
MUL{S} {,} ,
where:
Instruction Details
S If S is present, the instruction updates the flags. Otherwise, the flags are not updated.
In the Thumb instruction set, S can be specified only if both and are R0-R7 and
the instruction is outside an IT block.
See Standard assembler syntax fields on page A8-7.
The destination register.
The first operand register.
The second operand register.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
operand1 = SInt(R[n]); // operand1 = UInt(R[n]) produces the same final results
operand2 = SInt(R[m]); // operand2 = UInt(R[m]) produces the same final results
result = operand1 * operand2;
R[d] = result;
if setflags then
APSR.N = result;
APSR.Z = IsZeroBit(result);
if ArchVersion() == 4 then
APSR.C = bit UNKNOWN;
// else APSR.C unchanged
// APSR.V always unchanged
Exceptions
None.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-213