native on: all
Double the scalar widths in an unsigned fixed point vector.
The reason a special widen for fixed point is needed is because the fixed point is defined relative to the most significant side. Widening increases precision, but doesn't extend the value range.
The natively available byte widths on all Cores are 1, 2, 4, 8, and on the high end also 16.
Vector widen operations always produce two result vectors to accomodate the widening of maximum size vectors. The first result vector then contains the widened values of the lower half of the operand, and the second result the upper.
|Copper||E0 E1||2 2|
|Silver||E0 E1 E2 E3||2 2|
|Gold||E0 E1 E2 E3 E4 E5 E6 E7||2 2|
|Decimal8||E0 E1 E2 E3||2 2|
|Decimal16||E0 E1 E2 E3||2 2|