[llvm-dev] What's "register pressure set"

Xing Su via llvm-dev llvm-dev at lists.llvm.org
Mon May 23 00:57:23 PDT 2016

Hi everyone,

I'm looking through codes related to registered pressure tracking, mainly the source files 'RegisterPressure.h/cpp', 'MachineRegisterInfo.h/cpp', 'TargetRegisterInfo.h/cpp'. 

There is a concept I can hardly understand, the 'register pressure set'. Class 'TargetRegisterInfo' defines two virtual methods 'getRegClassPressureSets' and 'getRegUnitPressureSets' for querying but I don't see any subclasses overriding it. 

What's the meaning of the register pressure set? Anyone can give me some help?



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