.. _set_operation_latency:

set_operation_latency
---------------------

This parameter sets the latency of a given operation when compiled in LegUp.
Latency refers to the number of clock cycles required to complete the computation; an operation with latency one requires one cycle, while zero-latency operations are completely combinational, meaning multiple such operations can be chained together in a single clock cycle.

**Category**

HLS Constraints

**Value Type**

<operation> integer

**Valid Values**

See Default and Examples
Note: operator name should match the operation database file:
boards/PolarFire/PolarFire.tcl or boards/set_operation_latency.tcl

**Default Values**

::

    altfp_add 14
    altfp_subtract 14
    altfp_multiply 11
    altfp_divide_32 33
    altfp_divide_64 61
    altfp_truncate_64 3
    altfp_extend_32 2
    altfp_fptosi 6
    altfp_sitofp 6
    signed_comp_o 1
    signed_comp_u 1
    reg 2
    memory_port 2
    local_memory_port 1
    multiply 1

**Location Where Default is Specified**

``examples/legup.tcl``

**Dependencies**

None

**Applicable Flows**

All devices and flows

**Test Status**

Actively in-use

**Examples**

``set_operation_latency multiply 0``

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