12.93 VQSHL (by signed variable)

Vector Saturating Shift Left by signed variable.

Syntax

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

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

where:

cond

is an optional condition code.

datatype

must be one of S8, S16, S32, S64, U8, U16, U32, or U64.

Qd, Qm, Qn

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

Dd, Dm, Dn

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

Operation

VQSHL takes each element in a vector, shifts them by a value from the least significant byte of the corresponding element of a second vector, and places the results in the destination vector. If the shift value is positive, the operation is a left shift. Otherwise, it is a truncating right shift.

The sticky QC flag (FPSCR bit[27]) is set if saturation occurs.

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