2024-02-09 23:50:09 +01:00
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{"type":"NETLIST","name":"$root","addr":"(B)","loc":"a,0:0,0:0","timeunit":"1ps","timeprecision":"1ps","typeTablep":"(C)","constPoolp":"(D)","dollarUnitPkgp":"UNLINKED","stdPackagep":"UNLINKED","evalp":"UNLINKED","evalNbap":"UNLINKED","dpiExportTriggerp":"UNLINKED","delaySchedulerp":"UNLINKED","nbaEventp":"UNLINKED","nbaEventTriggerp":"UNLINKED","topScopep":"UNLINKED",
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"modulesp": [
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2025-08-22 12:44:35 +02:00
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{"type":"MODULE","name":"m","addr":"(E)","loc":"d,7:8,7:9","isChecker":false,"isProgram":false,"hasGenericIface":false,"origName":"m","level":0,"modPublic":false,"inLibrary":false,"dead":false,"recursiveClone":false,"recursive":false,"timeunit":"1ps","inlinesp": [],
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2024-02-09 23:50:09 +01:00
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"stmtsp": [
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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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{"type":"VAR","name":"clk","addr":"(F)","loc":"d,8:10,8:13","dtypep":"(G)","origName":"clk","isSc":false,"isPrimaryIO":false,"isPrimaryClock":false,"direction":"INPUT","isConst":false,"isPullup":false,"isPulldown":false,"isSigPublic":false,"isLatched":false,"isUsedLoopIdx":false,"noReset":false,"attrIsolateAssign":false,"attrFileDescr":false,"isDpiOpenArray":false,"isFuncReturn":false,"isFuncLocal":false,"lifetime":"VSTATIC","varType":"PORT","dtypeName":"logic","isSigUserRdPublic":false,"isSigUserRWPublic":false,"isGParam":false,"isParam":false,"attrScBv":false,"attrSFormat":false,"ignorePostWrite":false,"ignoreSchedWrite":false,"sensIfacep":"UNLINKED","childDTypep": [],"delayp": [],"valuep": [],"attrsp": []}
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2025-06-29 15:56:44 +02:00
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]}
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2024-02-09 23:50:09 +01:00
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],"filesp": [],
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"miscsp": [
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{"type":"TYPETABLE","name":"","addr":"(C)","loc":"a,0:0,0:0","constraintRefp":"UNLINKED","emptyQueuep":"UNLINKED","queueIndexp":"UNLINKED","streamp":"UNLINKED","voidp":"UNLINKED",
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"typesp": [
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{"type":"BASICDTYPE","name":"logic","addr":"(G)","loc":"d,8:10,8:13","dtypep":"(G)","keyword":"logic","generic":true,"rangep": []}
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]},
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{"type":"CONSTPOOL","name":"","addr":"(D)","loc":"a,0:0,0:0",
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"modulep": [
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2025-08-22 12:44:35 +02:00
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{"type":"MODULE","name":"@CONST-POOL@","addr":"(H)","loc":"a,0:0,0:0","isChecker":false,"isProgram":false,"hasGenericIface":false,"origName":"@CONST-POOL@","level":0,"modPublic":false,"inLibrary":false,"dead":false,"recursiveClone":false,"recursive":false,"timeunit":"NONE","inlinesp": [],
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2024-02-09 23:50:09 +01:00
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"stmtsp": [
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2024-04-02 05:11:15 +02:00
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{"type":"SCOPE","name":"@CONST-POOL@","addr":"(I)","loc":"a,0:0,0:0","aboveScopep":"UNLINKED","aboveCellp":"UNLINKED","modp":"(H)","varsp": [],"blocksp": [],"inlinesp": []}
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2025-06-29 15:56:44 +02:00
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]}
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2024-02-09 23:50:09 +01:00
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]}
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]}
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