You copied the Doc URL to your clipboard.

ARM Compiler armasm User Guide : VQDMULH (by vector or by scalar)

VQDMULH (by vector or by scalar)

Vector Saturating Doubling Multiply Returning High Half.

Syntax

VQDMULH{cond}.datatype {Qd}, Qn, Qm

VQDMULH{cond}.datatype {Dd}, Dn, Dm

VQDMULH{cond}.datatype {Qd}, Qn, Dm[x]

VQDMULH{cond}.datatype {Dd}, Dn, Dm[x]

where:

cond

is an optional condition code.

datatype

must be either S16 or S32.

Qd, Qn

are the destination vector and the first operand vector, for a quadword operation.

Dd, Dn

are the destination vector and the first operand vector, for a doubleword operation.

Qm or Dm

is the vector holding the second operand, for a by vector operation.

Dm[x]

is the scalar holding the second operand, for a by scalar operation.

Operation

VQDMULH multiplies corresponding elements in two vectors, doubles the results, and places the most significant half of the final results in the destination vector.

The second operand can be a scalar instead of a vector.

If any of the results overflow, they are saturated. The sticky QC flag (FPSCR bit[27]) is set if saturation occurs. Each result is truncated.

Related reference

Previous Next
Was this page helpful? Yes No