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VSHLL

Vector Shift Left Long takes each element in a doubleword vector, left shifts them by an immediate value, and places the results in a quadword vector.

The operand elements can be:

• 8-bit, 16-bit, or 32-bit signed integers.
• 8-bit, 16-bit, or 32-bit unsigned integers.
• 8-bit, 16-bit, or 32-bit untyped integers, maximum shift only.

The result elements are twice the length of the operand elements.

Depending on settings in the CPACR, NSACR, and HCPTR registers, and the Security 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 A2 ) and T32 ( T1 and T2 ) .

A1

Decode for this encoding

if imm6 == '000xxx' then See("Related encodings"); end; if imm6 IN {'001000', '010000', '100000'} then See("VMOVL"); end; if Vd[0] == '1' then Undefined(); end; let esize : integer{} = 8 << HighestSetBitNZ(imm6[5:3]); let elements : integer = 64 DIV esize; let shift_amount : integer = UInt(imm6) - esize; let unsigned : boolean = (U == '1'); let d : integer = UInt(D::Vd); let m : integer = UInt(M::Vm);

A2

Decode for this encoding

if size == '11' || Vd[0] == '1' then Undefined(); end; let esize : integer{} = 8 << UInt(size); let elements : integer = 64 DIV esize; let shift_amount : integer = esize; let unsigned : boolean = FALSE; // Or TRUE without change of functionality let d : integer = UInt(D::Vd); let m : integer = UInt(M::Vm);

T1

Decode for this encoding

if imm6 == '000xxx' then See("Related encodings"); end; if imm6 IN {'001000', '010000', '100000'} then See("VMOVL"); end; if Vd[0] == '1' then Undefined(); end; let esize : integer{} = 8 << HighestSetBitNZ(imm6[5:3]); let elements : integer = 64 DIV esize; let shift_amount : integer = UInt(imm6) - esize; let unsigned : boolean = (U == '1'); let d : integer = UInt(D::Vd); let m : integer = UInt(M::Vm);

T2

Decode for this encoding

if size == '11' || Vd[0] == '1' then Undefined(); end; let esize : integer{} = 8 << UInt(size); let elements : integer = 64 DIV esize; let shift_amount : integer = esize; let unsigned : boolean = FALSE; // Or TRUE without change of functionality let d : integer = UInt(D::Vd); let m : integer = UInt(M::Vm);

Assembler Symbols