ABS

Absolute value

This instruction calculates the absolute value of the signed integer value in the source register, and writes the result to the destination register. If the value in the source register is the most negative value, the result is the same as the value in the source register.

Integer class

(FEAT_CSSC)

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
sf	1	0	1	1	0	1	0	1	1	0	0	0	0	0	0	0	0	1	0	0	0	Rn					Rd
		S									opcode2					opcode

32-bit encoding

(sf == 0)

ABS <Wd>, <Wn>

64-bit encoding

(sf == 1)

ABS <Xd>, <Xn>

Decode (all encodings)

if !IsFeatureImplemented(FEAT_CSSC) then EndOfDecode(Decode_UNDEF); end; let datasize : integer{} = 32 << UInt(sf); let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn);

Assembler Symbols

<Wd>	Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.

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

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

<Xn>	Is the 64-bit name of the general-purpose source register, encoded in the "Rn" field.

Operation

let operand1 : bits(datasize) = X{}(n); let result : integer = Abs(SInt(operand1)); X{datasize}(d) = result[datasize-1:0];

Operational information

This instruction is a data-independent-time instruction as described in About PSTATE.DIT.

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ABS