Overview

Vector data-types pack multiple scalar data elements into a wider vector. There are vector data-types with standard sized elements (8-bit, 16-bit, 32-bit, 64-bit), as well as accumulator types with wider element data-width (48-bit, 80-bit) for maintaining higher precision during arithmetic operations. A 48-bit accumulator element can be used to store the result of 16x16 (or 16x8) multiply-accumulate operations, while an 80-bit accumulator element can be used to store the result of 32x32 multiply-accumulate operations, without loss of precision. Furthermore, results from mixed precision computations higher than 16x8, namely, 16x32 and 32x16 can be stored either in a 48-bit or an 80-bit accumulator.

The general naming convention for these data-types is shown below.

    v{NumLanes}[c]{[u]int|float|acc}{SizeofElement}

Optional specifications :

'c' denotes complex data with real and imaginary parts packed together
'float' denotes single precision floating point values. (Note : there are no accumulator registers for floating point vectors)
'u' denotes unsigned

For example, v16int8, v4cint16, v2int128, v4cacc48, v8acc80, v4float

The total data-width of the vector data-types can be 128-bits, 256-bits, 512-bits, or 1024-bits. The total data-width of the accumulator data-types can be 320/384-bits or 640/768-bits.

Note: Vector and Accumulator data-types are stored in different sets of registers within the AIE. Large vectors (>128-bits) and accumulators (>320/384-bits) occupy more than one physical register. Register spills will reduce performance when more than one large register is 'live'.

Modules
	Accumulator Types

	Floating Point Vector Types

	Integer Vector Types

Overview

Modules