SMADDL

Signed multiply-add long

This instruction multiplies two 32-bit register values, adds a 64-bit register value, and writes the result to the 64-bit destination register.

This instruction is used by the alias SMULL.

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	0	0	1	1	0	1	1	0	0	1	Rm					0	Ra					Rn					Rd
sf	op54							U								o0

Encoding

SMADDL <Xd>, <Wn>, <Wm>, <Xa>

Decode for this encoding

constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant integer a = UInt(Ra);

Assembler Symbols

<Xd>	Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.

<Wn>	Is the 32-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field.

<Wm>	Is the 32-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field.

<Xa>	Is the 64-bit name of the third general-purpose source register holding the addend, encoded in the "Ra" field.

Alias Conditions

Alias	Is preferred when
SMULL	Ra == '11111'

Operation

constant bits(32) operand1 = X[n, 32]; constant bits(32) operand2 = X[m, 32]; constant bits(64) operand3 = X[a, 64]; constant integer result = SInt(operand3) + (SInt(operand1) * SInt(operand2)); X[d, 64] = result<63:0>;