mask

From Mill Computing Wiki
Revision as of 18:52, 20 December 2014 by Generator (Talk | contribs)

Jump to: navigation, search
realizing  exu stream  exu block  compute phase   operation   in the logical value domain  

native on: all

Convert between bitmasks and bool vectors.

The lowest width bits of a bitmask become the element bool values of a new vector, or the bool element values of a vector become the new bits in a bitmask, depending on whether the input operand is a scalar or a vector.


mask(bit bits0, bit bits1, width w) → op r0

operands: like Identity [xx:x]

This doesn't work with vectors at all. It doesn't even have belt operands. It is rather a way to produce a class of often used constant values that usually would take a lot of space as a normal manifest constant.

The values produced by mask are bitmasks: A sequence of ones in an otherwise empty bitfield, or a sequence of zeros in an otherwise filled bitfield.

The two bit paramters are the start and stop bit indices, i.e. the greater value is the highest order bit that is part of the sequence, and the lower value is the highest order bit not part of the sequence anymore. When the greater value is first, it is a series of ones within zeros, when it is second, it is a series of zeros within ones.

Core In Slots Latencies
Tin E0 1
Copper E0 E1 1
Silver E0 E1 E2 E3 1
Gold E0 E1 E2 E3 E4 E5 E6 E7 1
Decimal8 E0 E1 E2 E3 1
Decimal16 E0 E1 E2 E3 1

mask(op v, width w) → op r0

operands: like Mask xX:X|Xx:x


Core In Slots Latencies
Tin E0 1
Copper E0 E1 1
Silver E0 E1 E2 E3 1
Gold E0 E1 E2 E3 E4 E5 E6 E7 1
Decimal8 E0 E1 E2 E3 1
Decimal16 E0 E1 E2 E3 1


Instruction Set, alphabetical, Instruction Set by Category, Instruction Set, sortable, filterable