Migration Guide From Vitis/Vivado HLS to SmartHLS¶

Pragmas¶

Vitis/Vivado HLS	SmartHLS
aggregate, data_pack	See the Struct Argument Packing and Struct Variable Packing pragmas.
allocation	A global constraint of operation resources can be set via set_resource_constraint; constraining the operation resource within a function, a loop or a block of code is not yet available. Functions that are not inlined (automatically by SmartHLS tool or specified via the Inline Function pragma) always have a single RTL module instance in hardware, and it is shared by all callers. Replication of a function instance in hardware can be achieved by the Replicate Function and Inline Function pragmas. In the case of multi-threading, each thread of a function creates an instance of the corresponding RTL module.
array_partition	See the Partition Top-Level Interface and Partition Memory pragmas. The cyclic, block, factor, and dim options are not yet supported.
dataflow	Function Pipelining and Multi-threading can be used to implement a task-level (dataflow) pipeline.
disaggregate	See the `struct_fields` option of the Partition Top-Level Interface pragma.
expression_balance	See LATENCY_REDUCTION TCL settings to control the expression balance optimization.
function_instantiate	The equivalent optimization can be achieved with the Inline Function pragma or C++ template functions.
inline	See the Inline Function pragma.
interface	See Top-Level RTL Interface for details about supported interfaces and corresponding pragmas.
pipeline	See Pipeline Function and Pipeline Loop pragmas.
stable	See the `stable` option of the Configure Scalar Argument Interface pragma.
stream	Streaming interface is implemented via the hls::FIFO Argument.
top	See the Set Custom Top-Level Function pragma.
unroll	See the Unroll Loop pragma.

The following Vitis/Vivado HLS pragmas do not have an equivalent support in SmartHLS yet: array_map, array_reshape, bind_op, bind_storage, dependence, disaggregate, latency, loop_flatten, loop_merge, loop_tripcount, occurrence, protocol, reset, shared.

Libraries¶

Arbitrary Precision Data Types¶

Similar to Vitis/Vivado HLS, SmartHLS provides C++ Arbitrary Precision Integer Library and C++ Arbitrary Precision Fixed Point Library.

Streaming Library¶

Similar to the hls::stream template class in Vitis/Vivado HLS, SmartHLS provides a hls::fifo template class in the Streaming Library.

Math Library¶

SmartHLS supports a subset of functions in the Math Library (math.h), but does not yet have a math function library that is optimized for hardware implementation with customizable arbitrary precisions.

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