Migrating to the LLVM New Pass Manager: Modularizing Your IR Pipeline
Learn how to transition from the LLVM Legacy Pass Manager to the New Pass Manager (NPM) to improve IR pipeline efficiency and modularity.
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llvmLLVM New Pass Manager and Legacy Pass Adapter Analysis Caching
PassManagerAdapter and Analysis Result Persistence The transition to the New Pass Manager (NPM) in LLVM introduces a functional approach to pass orchestration, utilizing a nested pipeline structure to optimize IR. To maintain compatibility during migration, the PassManagerAdapter allows legacy passes to execute within the NPM framework. A critical design con
New Pass Manager: PreservedAnalyses and Analysis Cache Invalidation
Analysis Result Persistence in the New Pass Manager The LLVM New Pass Manager (NPM) utilizes a caching mechanism for analysis results to optimize the pipeline. To maintain correctness, passes must explicitly specify which analyses remain valid after an IR transformation by returning a PreservedAnalyses object. When a pass modifies the IR but fails to correct