Alternative analysis pass that computes machine block frequencies on demand.
Synopsis
Declared in <llvm/CodeGen/LazyMachineBlockFrequencyInfo.h>
class LazyMachineBlockFrequencyInfoPass
: public MachineFunctionPassDescription
This is an alternative analysis pass to MachineBlockFrequencyInfo. The difference is that with this pass, the block frequencies are not computed when the analysis pass is executed but rather when the BFI result is explicitly requested by the analysis client.
This works by checking querying if MBFI is available and otherwise generating MBFI on the fly. In this case the passes required for (LI, DT) are also queried before being computed on the fly.
Note that it is expected that we wouldn't need this functionality for the new PM since with the new PM, analyses are executed on demand.
Base Classes
Name |
Description |
FunctionPass adapter for passes that operate on a MachineFunction. |
Member Functions
Name |
Description |
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Construct a LazyMachineBlockFrequencyInfoPass. |
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Passes are not assignable. |
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createPrinterPass ‐ Get a function printer pass. |
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Perform any cleanup needed after all passes have run. |
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Cache this pass's MachineFunctionProperties at module initialization. |
Print this pass's state to stderr for debugging. |
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Print the pass nesting structure for ‐debug‐passes=PassStructure. |
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Get an optional analysis result that may already be available. |
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Declare the analyses required and preserved by this pass. |
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Return this pass as an ImmutablePass, or null if it is not one. |
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Return this pass as a PMDataManager when it is a nested pass manager. |
Compute and return the block frequencies. |
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Return a nice clean name for a pass corresponding to that used to enable the pass in opt. |
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getPassID ‐ Return the PassID number that corresponds to this pass. |
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Return the kind of pass (module, function, loop, etc.). |
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Return a human‐readable name for this pass. |
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Return what kind of Pass Manager can manage this pass. |
Return the analysis resolver installed for this pass. |
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Report whether the analysis identified by |
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Check whether available pass managers are suitable for this pass. |
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Print the internal state of this pass for analysis dumping. |
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Serialize the IR unit this pass operates on for ‐‐print‐changed. |
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Release the cached lazy MBFI between runs. |
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runOnFunction ‐ Virtual method overriden by subclasses to do the per‐function processing of the pass. |
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Set up lazy BFI analysis for machine function |
Install the analysis resolver used to satisfy this pass's dependencies. |
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verifyAnalysis() ‐ This member can be implemented by a analysis pass to check state of analysis information. |
Static Member Functions
Name |
Description |
Construct a new instance of the pass identified by |
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Static Data Members
Name |
Description |
Pass identification, replacement for typeid. |
Protected Member Functions
Name |
Description |
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getAnalysisUsage ‐ Subclasses that override getAnalysisUsage must call this. |
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Return the MachineFunctionProperties this pass clears when it runs. |
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Return the MachineFunctionProperties this pass requires before running. |
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Return the MachineFunctionProperties this pass sets after running. |
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runOnMachineFunction ‐ This method must be overloaded to perform the desired machine code transformation or analysis. |
Check whether this optional pass should be skipped for |
Non-Member Functions
Name |
Description |
Build a SimplifyQuery from analyses currently valid in a pass. |
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Request the timer for this legacy‐pass‐manager's pass instance. |
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Check whether a pass is a BitcodeWriterPass. |
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Return true if a pass is for IR printing. |
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