2023-11-04 18:28:36 +01:00
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%Warning-DEPRECATED: Option --trace-fst-thread is deprecated. Use --trace-fst with --trace-threads > 0.
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2022-10-22 19:45:48 +02:00
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... For warning description see https://verilator.org/warn/DEPRECATED?v=latest
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... Use "/* verilator lint_off DEPRECATED */" and lint_on around source to disable this message.
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%Warning-DEPRECATED: Option order-clock-delay is deprecated and has no effect.
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Deprecate clocker attribute and --clk option (#6463)
The only use for the clocker attribute and the AstVar::isUsedClock that
is actually necessary today for correctness is to mark top level inputs
of --lib-create blocks as being (or driving) a clock signal. Correctness
of --lib-create (and hence hierarchical blocks) actually used to depend
on having the right optimizations eliminate intermediate clocks (e.g.:
V3Gate), when the top level port was not used directly in a sensitivity
list, or marking top level signals manually via --clk or the clocker
attribute. However V3Sched::partition already needs to trace through the
logic to figure out what signals might drive a sensitivity list, so it
can very easily mark all top level inputs as such.
In this patch we remove the AstVar::attrClocker and AstVar::isUsedClock
attributes, and replace them with AstVar::isPrimaryClock, automatically
set by V3Sched::partition. This eliminates all need for manual
annotation so we are deprecating the --clk/--no-clk options and the
clocker/no_clocker attributes.
This also eliminates the opportunity for any further mis-optimization
similar to #6453.
Regarding the other uses of the removed AstVar attributes:
- As of 5.000, initial edges are triggered via a separate mechanism
applied in V3Sched, so the use in V3EmitCFunc.cpp is redundant
- Also as of 5.000, we can handle arbitrary sensitivity expressions, so
the restriction on eliminating clock signals in V3Gate is unnecessary
- Since the recent change when Dfg is applied after V3Scope, it does
perform the equivalent of GateClkDecomp, so we can delete that pass.
2025-09-20 16:50:22 +02:00
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%Warning-DEPRECATED: Option '--clk' is deprecated and has no effect.
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%Warning-DEPRECATED: Option '--no-clk' is deprecated and has no effect.
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2022-10-22 19:45:48 +02:00
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%Error: Exiting due to
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