VQ{R}DMULH (by vector or by scalar)

Vector Saturating Doubling Multiply instructions multiply their operands and double the results. They return only the high half of the results.

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

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VQ{R}DMULH{cond}.datatype {Qd}, Qn, Qm
VQ{R}DMULH{cond}.datatype {Dd}, Dn, Dm
VQ{R}DMULH{cond}.datatype {Qd}, Qn, Dm[x]
VQ{R}DMULH{cond}.datatype {Dd}, Dn, Dm[x]

where:

R

if present, indicates that each result is rounded. Otherwise, each result is truncated.

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.

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Reference:
Copyright © 2010-2011 ARM. All rights reserved.ARM DUI 0489E
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