Compile Options - 2023.1 English - UG1553

The syn.compile commands specify the default behavior for compilation of the HLS component.

syn.compile.design_size_max_warning

Specifies the design size that triggers a warning related to slow compilation or poor QoR.

syn.compile.design_size_maximum_warning=300000

syn.compile.enable_auto_rewind

When true enables an alternative HLS implementation for pipelined loops which uses automatic loop rewind as described in Rewinding Pipelined Loops for Performance for additional information.

syn.compile.enable_auto_rewind=1

syn.compile.ignore_long_run_time

Disable long run time warning.

syn.compile.ignore_long_run_time=1

syn.compile.name_max_length <arg>

The name_max_length option will specify the maximum length of function names. If the length is over the threshold, the last part of the name will be truncated.

syn.compile.name_max_length=13

syn.compile.no_signed_zeros

The no_signed_zeros option will ignore the signedness of floating point zero so that compiler can do aggressive optimizations on floating point operations.

syn.compile.no_signed_zeros=1

syn.compile.pipeline_flush_in_task arg

Enable non-rewind pipelines in a dataflow process to be flushing by default. The options are:

• always: Always flush the pipeline in task
• ii1: Only flush the pipeline in task when II=1. This is the default setting
• never: Disable pipeline flush in task

syn.compile.pipeline_flush_in_task=always

syn.compile.pipeline_loops arg

Loops with a tripcount equal to or greater than the specified value will be pipelined automatically.

syn.compile.pipeline_loops=20

syn.compile.pipeline_style arg

Set default pipeline style, this is a preference not a hard constraint. Refer to Flushing Pipelines and Pipeline Types for more information. The three styles are: stallable (stp), flushable (flp), and free-running (frp). The default is free-running.

syn.compile.pipeline_style=flp

syn.compile.pragma_strict_mode

Enable errors instead of warnings for unrecognized and improper pragma syntax.

syn.compile.pragma_strict_mode=1

syn.compile.unsafe_math_optimizations

The unsafe_math_optimizations option will ignore the signedness of floating point zero and enable associative floating point operations so that compiler can do aggressive optimizations on floating point operations.

syn.compile.unsafe_math_optimizations=1

Important: Using this option might change the result of any floating point calculations and result in a mismatch in C/RTL co-simulation. Please ensure your test bench is tolerant of differences and checks for a margin of difference, not exact values.