[llvm-bugs] [Bug 49011] New: CSSPGO support in LLVM isn't complete

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49011

            Bug ID: 49011
           Summary: CSSPGO support in LLVM isn't complete
           Product: new-bugs
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: wenlei at fb.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org
            Blocks: 48902

We’ve been working on bringing up context-sensitive sample PGO
(https://lists.llvm.org/pipermail/llvm-dev/2020-August/144101.html) in LLVM
since last year. With the cut point for 12 release, clang-12 will have
incomplete (~90%) CSSPGO that is buggy. 

Porting over the following patches will enable 12 release to have complete
CSSPGO support. The patches should be very low risk and have zero impact on
mainstream stability as it’s purely new functionality.

https://reviews.llvm.org/rG7e99bddfeaab2713a8bb6ca538da25b66e6efc59
https://reviews.llvm.org/rG224fee8219bb3aed34f13ce40935e1b3ede90a0f
https://reviews.llvm.org/rGd3e2e3740d0730cb6788c771bb01a8f3e935bf2e
https://reviews.llvm.org/rG3d89b3cbec230633e8228787819b15116c1a1730
https://reviews.llvm.org/rG6bae5973c476e16dbbc82030d65c7859a6628e89
https://reviews.llvm.org/rG1645f465be85223e9f5b6303a3e5e0e491fd819f
The last few patches in this stack https://reviews.llvm.org/D92998 (expect to
be pushed to trunk in the next few days)


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=48902
[Bug 48902] [meta] 12.0.0 Release Blockers
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