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VCLT (register)

Vector Compare Less Than takes each element in a vector, and compares it with the corresponding element of a second vector. If the first is less than the second, the corresponding element in the destination vector is set to all ones. Otherwise, it is set to all zeros.

This is a pseudo-instruction of VCGT (register). This means:

  • The encodings in this description are named to match the encodings of VCGT (register).
  • The assembler syntax is used only for assembly, and is not used on disassembly.
  • The description of VCGT (register) gives the operational pseudocode for this instruction.

It has encodings from the following instruction sets: A32 ( A1 and A2 ) and T32 ( T1 and T2 ) .

A1

313029282726252423222120191817161514131211109876543210
1111001U0DsizeVnVd0011NQM0Vm

64-bit SIMD vector (Q == 0)

VCLT{<c>}{<q>}.<dt> {<Dd>, }<Dn>, <Dm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Dd>, <Dm>, <Dn>

128-bit SIMD vector (Q == 1)

VCLT{<c>}{<q>}.<dt> {<Qd>, }<Qn>, <Qm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Qd>, <Qm>, <Qn>

A2

313029282726252423222120191817161514131211109876543210
111100110D1szVnVd1110NQM0Vm

64-bit SIMD vector (Q == 0)

VCLT{<c>}{<q>}.<dt> {<Dd>, }<Dn>, <Dm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Dd>, <Dm>, <Dn>

128-bit SIMD vector (Q == 1)

VCLT{<c>}{<q>}.<dt> {<Qd>, }<Qn>, <Qm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Qd>, <Qm>, <Qn>

T1

15141312111098765432101514131211109876543210
111U11110DsizeVnVd0011NQM0Vm

64-bit SIMD vector (Q == 0)

VCLT{<c>}{<q>}.<dt> {<Dd>, }<Dn>, <Dm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Dd>, <Dm>, <Dn>

128-bit SIMD vector (Q == 1)

VCLT{<c>}{<q>}.<dt> {<Qd>, }<Qn>, <Qm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Qd>, <Qm>, <Qn>

T2

15141312111098765432101514131211109876543210
111111110D1szVnVd1110NQM0Vm

64-bit SIMD vector (Q == 0)

VCLT{<c>}{<q>}.<dt> {<Dd>, }<Dn>, <Dm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Dd>, <Dm>, <Dn>

128-bit SIMD vector (Q == 1)

VCLT{<c>}{<q>}.<dt> {<Qd>, }<Qn>, <Qm>

is equivalent to

VCGT{<c>}{<q>}.<dt> <Qd>, <Qm>, <Qn>

Assembler Symbols

<Dm>

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

<Dn>

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

<Qm>

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

<Qn>

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

<c>

For encoding A1 and A2: see Standard assembler syntax fields. This encoding must be unconditional.

For encoding T1 and T2: see Standard assembler syntax fields.

<q>

See Standard assembler syntax fields.

<dt> For encoding A1 and T1: is the data type for the elements of the operands, encoded in U:size:
U size <dt>
0 00 S8
0 01 S16
0 10 S32
1 00 U8
1 01 U16
1 10 U32
For encoding A2 and T2: is the data type for the elements of the vectors, encoded in sz:
sz <dt>
0 F32
1 F16
<Qd>

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

<Dd>

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

Operation

The description of VCGT (register) gives the operational pseudocode for this instruction.

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