widensfv

speculable  exu stream  exu block  compute phase   operation   in the signed fixed point value domain  

native on: all

Double the scalar widths in a signed 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.

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widensfv(sf v) → sf r0, sf r1

operands: like Widenv XX:2X2X

Core	In Slots	Latencies
Tin	E0	2 2
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

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