Dehao Chen a2cdd9ac6d Add sample PGO support to ThinLTO new pass manager. ... Summary: For SamplePGO + ThinLTO, because profile annotation is done twice at both PrepareForThinLTO pipeline and backend compiler, the following changes are needed at the PrepareForThinLTO phase to ensure the IR is not changed dramatically. Otherwise the profile annotation will be inaccurate in the backend compiler. * disable hot-caller heuristic * disable loop unrolling * disable indirect call promotion This will unblock the new PM testing for sample PGO (tools/clang/test/CodeGen/pgo-sample-thinlto-summary.c), which will be covered in another cfe patch. Reviewers: chandlerc, tejohnson, davidxl Reviewed By: tejohnson Subscribers: sanjoy, mehdi_amini, Prazek, inglorion, llvm-commits Differential Revision: https://reviews.llvm.org/D34895 llvm-svn: 307437		2017-07-07 20:53:10 +00:00
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PassBuilder.h	Add sample PGO support to ThinLTO new pass manager.	2017-07-07 20:53:10 +00:00