[LLVMdev] Dynamically loadable pass doesn't show up in opt's pass list (original) (raw)

Frank Winter fwinter at jlab.org
Tue Jul 7 09:31:26 PDT 2015

Hi All!

I'd like to create a dynamically loadable version of the SLP vectorizer pass which should be named differently than the original (e.g. 'slp-mod'). (The reason for why I'd like this is that I need to modify the pass and I'd like a quick modify/build/test cycle.)

I copied the file to a separate directory (SLPVectorizer.cpp -> my_pass/SLPMod.cpp), renamed the SLPVectorizer class to SLPMod and use the same pass registration as in the original pass:

#define SV_NAME "slp-mod" #define DEBUG_TYPE "SLPMod"

static const char lv_name[] = "SLP Mod"; INITIALIZE_PASS_BEGIN(SLPMod, SV_NAME, lv_name, false, false) INITIALIZE_AG_DEPENDENCY(AliasAnalysis) INITIALIZE_AG_DEPENDENCY(TargetTransformInfo) INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker) INITIALIZE_PASS_DEPENDENCY(ScalarEvolution) INITIALIZE_PASS_DEPENDENCY(LoopSimplify) INITIALIZE_PASS_END(SLPMod, SV_NAME, lv_name, false, false)

I got this to build and 'opt' seems to succeed in dynamically loading it. However, the pass is not callable with -slp-mod, nor does it show up in the pass list with -help.

Is the way as above indicated correct for registration of a dynamically loadable pass?

Thanks, Frank

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