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VCADD

Vector Complex Add.

One of the two vector elements that are read from each of the numbers in the second source SIMD&FP register can be optionally negated based on the rotation value:

This instruction operatesadds oncorresponding complex numbers from the two source vector registers and writes the resulting complex numbers into the destination vector register. The number of complex numbers that arecan be stored in the source and the destination vector registers is calculated as the vector register size divided by the length of each complex number. Each complex number is represented in a SIMD&FP registersregister as pairsa pair of elements, with the more significant element holding the imaginary part of the number andbeing placed in the lessmore significant element, holdingand the real part of the number.number Eachbeing elementplaced holdsin athe floating-pointless value.significant Itelement. performsBoth thereal followingand computationimaginary onparts of the correspondingsource and the resulting complex number elementare pairsrepresented fromas thefloating-point two source registers:values.

Depending on settings in the CPACR, NSACR, and HCPTR registers, and the Securitysecurity state and PE mode in which the instruction is executed, an attempt to execute the instruction might be undefined, or trapped to Hyp mode. For more information see Enabling Advanced SIMD and floating-point support.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1
(ARMv8.3)

313029282726252423222120191817161514131211109876543210
1111110rot1D0SVnVd1000NQM0Vm

64-bit SIMD vector (Q == 0)

VCADD{<q>}.<dt> <Dd>, <Dn>, <Dm>, #<rotate>

128-bit SIMD vector (Q == 1)

VCADD{<q>}.<dt> <Qd>, <Qn>, <Qm>, #<rotate>

if !HaveFCADDExtHaveFJCVTZSExt() then UNDEFINED; if Q == '1' && (Vd<0> == '1' || Vn<0> == '1' || Vm<0> == '1') then UNDEFINED; d = UInt(D:Vd); n = UInt(N:Vn); m = UInt(M:Vm); esize = 16 << UInt(S); if !HaveFP16Ext() && esize == 16 then UNDEFINED; elements = 64 DIV esize; regs = if Q=='0' then 1 else 2; if CurrentInstrSet() == InstrSet_T32 then if InITBlock() && esize == 16 then UNDEFINED; elements = 64 DIV esize; regs = if Q == '0' then 1 else 2;() then UNPREDICTABLE;

T1
(ARMv8.3)

15141312111098765432101514131211109876543210
1111110rot1D0SVnVd1000NQM0Vm

64-bit SIMD vector (Q == 0)

VCADD{<q>}.<dt> <Dd>, <Dn>, <Dm>, #<rotate>

128-bit SIMD vector (Q == 1)

VCADD{<q>}.<dt> <Qd>, <Qn>, <Qm>, #<rotate>

ifif ! InITBlockHaveFJCVTZSExt() then UNPREDICTABLE; if !() then UNDEFINED; if Q == '1' && (Vd<0> == '1' || Vn<0> == '1' || Vm<0> == '1') then UNDEFINED; d =HaveFCADDExt() then UNDEFINED; if Q == '1' && (Vd<0> == '1' || Vn<0> == '1' || Vm<0> == '1') then UNDEFINED; d = UInt(D:Vd); n = UInt(N:Vn); m = UInt(M:Vm); esize = 16 << UInt(S); if !HaveFP16Ext() && esize == 16 then UNDEFINED; elements = 64 DIV esize; regs = if Q=='0' then 1 else 2; if CurrentInstrSet() == InstrSet_T32 then if InITBlock() && esize == 16 then UNDEFINED; elements = 64 DIV esize; regs = if Q == '0' then 1 else 2;() then UNPREDICTABLE;

Assembler Symbols

<q>

See Standard assembler syntax fields.

<dt> Is the data type for the elements of the vectors, encoded in S:
S<dt>
0F16
1F32
<Qd>

Is the 128-bit name of the SIMD&FP destination register, encoded in the "D:Vd" field as <Qd>*2.

<Qn>

Is the 128-bit name of the first SIMD&FP source register, encoded in the "N:Vn" field as <Qn>*2.

<Qm>

Is the 128-bit name of the second SIMD&FP source register, encoded in the "M:Vm" field as <Qm>*2.

<Dd>

Is the 64-bit name of the SIMD&FP destination register, encoded in the "D:Vd" field.

<Dn>

Is the 64-bit name of the first SIMD&FP source register, encoded in the "N:Vn" field.

<Dm>

Is the 64-bit name of the second SIMD&FP source register, encoded in the "M:Vm" field.

<rotate> Is the rotation to be applied to elements in the second SIMD&FP source register, encoded in rot:
rot<rotate>
090
1270

Operation

EncodingSpecificOperations(); CheckAdvSIMDEnabled(); for r = 0 to regs-1 operand1 = operand2 = D[n+r]; operand2 = operand1 = D[m+r]; operand3 = D[d+r]; for e = 0 to (elements DIV 2)-1 case rot of when '0' element1 = FPNeg(Elem[operand2,e*2+1,esize]); [operand1,e*2+1,esize]); element3 = Elem[operand2,e*2,esize]; [operand1,e*2,esize]; when '1' element1 = Elem[operand2,e*2+1,esize]; [operand1,e*2+1,esize]; element3 = FPNeg(Elem[operand2,e*2,esize]); [operand1,e*2,esize]); result1 = FPAdd(Elem[operand1,e*2,esize],element1,[operand2,e*2,esize],element1,StandardFPSCRValue()); result2 = FPAdd(Elem[operand1,e*2+1,esize],element3,[operand2,e*2+1,esize],element3,StandardFPSCRValue()); Elem[D[d+r],e*2,esize] = result1; Elem[D[d+r],e*2+1,esize] = result2;


Internal version only: isa v00_79v00_76, pseudocode v34.2v33.1 ; Build timestamp: 2017-12-19T152017-09-26T15:4210

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