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#504 (#551)
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Fixes #589
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Performs DCE by constructing a global dependency graph starting with top-level
outputs, external module ports, and simulation constructs as circuit sinks.
External modules can optionally be eligible for DCE via the
OptimizableExtModuleAnnotation.
Dead code is eliminated across module boundaries. Wires, ports, registers, and
memories are all eligible for removal. Components marked with a
DontTouchAnnotation will be treated as a circuit sink and thus anything that
drives such a marked component will NOT be removed.
This transform preserves deduplication. All instances of a given DefModule are
treated as the same individual module. Thus, while certain instances may have
dead code due to the circumstances of their instantiation in their parent
module, they will still not be removed. To remove such modules, use the
NoDedupAnnotation to prevent deduplication.
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Now, any annotation not propagated by a transform is considered deleted.
A new DeletedAnnotation is added in place of it.
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This fixes an issue I was having with my ClockListAnnotations being duplicated.
h/t @azidar
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* fixed up impementation of deleteDirectoryHierarchy
Added a few more tests
* Round 2 of moving verilog to target dir
Only create .f file if some files have been moved
Some small style fixes in Driver
Restored lost functionality to add -f argument in verilogToCpp
Fixed loadAnnotations to add targetDir regardless of annotations arriving from file or through options
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* First pass at implementing a annotation based mechanism to move black box verilator files into the target directory
* A little bit of style cleanup
* A little bit of style cleanup
* Fix the driver, wasn't appending targetDir properly
Add some docs
* test had wrong value now that targetdir is added to annnos
* Now saves a list of all black box verilog files moved into target directory.
Then creates a file black_box_verilog_files.f that contains this list with -v prepended to each line
* Made black box source helper be low to low form
Added it to the verilog compiler transforms
Added a test to make sure it got there
* targetDir annotation is targeted to a CircuitName("All")
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FileInfo is merged
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Restricts annotations to be string-based (and thus less typesafe)
Makes annotations more easily serializable and interact with Chisel
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getMyAnnotations now returns Seq[Annotation]
Changed test to check number of annotations is the same
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