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

The Instruction Sets
Signed Most Significant Word Multiply
Subtract
SMMLS on page A8-348 32 = 32 – 32 x 32 b
Signed Most Significant Word Multiply SMMUL on page A8-350 32 = 32 x 32 b
Signed Dual Multiply Add SMUAD on page A8-352 32 = 16 x 16 + 16 x 16
Signed Multiply (halfwords) SMULBB, SMULBT,
SMULTB, SMULTT on
page A8-354
32 = 16 x 16
Signed Multiply Long SMULL on page A8-356 64 = 32 x 32
Signed Multiply (word by halfword) SMULWB, SMULWT on
page A8-358
Table A4-5 Signed multiply instructions (continued)
Instruction See Operation (number of bits)
32 = 32 x 16 a
Signed Dual Multiply Subtract SMUSD on page A8-360 32 = 16 x 16 – 16 x 16
a. The most significant 32 bits of the 48-bit product are used. Less significant bits are discarded.
b. The most significant 32 bits of the 64-bit product are used. Less significant bits are discarded.
Table A4-6 Unsigned multiply instructions
Instruction See Operation (number of bits)
Unsigned Multiply Accumulate Accumulate Long UMAAL on page A8-482 64 = 32 + 32 + 32 x 32
Unsigned Multiply Accumulate Long UMLAL on page A8-484 64 = 64 + 32 x 32
Unsigned Multiply Long UMULL on page A8-486 64 = 32 x 32
A4-12 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B