vector.bitpack
← vector dialect
Pack the low bits of each integer source lane into a contiguous little-endian bitstream stored in integer result lanes. Source lanes are consumed in logical lane order and width gives the number of bits taken from each source lane.
Operation contract
| Property |
Value |
| Semantic phase |
executable |
| Traits |
Pure |
Signature
| Kind |
Name |
Type |
Cardinality |
Description |
| Operand |
source |
vector |
required |
Integer lanes whose low width bits are packed. |
| Result |
result |
vector |
required |
Integer storage lanes containing the packed bitstream. |
| Attribute |
width |
i64 |
required |
Number of low source bits consumed from each lane. |
Verification constraints
HasIntegerElement(source)HasIntegerElement(result)PositiveBitWidthAttr(width)ElementWidthAtLeastAttr(source, width)PackedPayloadBitCountMatchesStorage(source, width, result, result)
Examples
%packed = vector.bitpack<4> %codes : vector<32xi8> -> vector<16xi8>
%packed = vector.bitpack<1> %mask : vector<128xi1> -> vector<16xi8>