mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-26 18:36:05 +00:00
245cddae70
Commit fe05193 (phab D156569), IRPGO names uses format `[<filepath>;]<linkage-name>` while prior format is `[<filepath>:<mangled-name>`. The format change would break the use case demonstrated in (updated) `llvm/test/Transforms/PGOProfile/thinlto_indirect_call_promotion.ll` and `compiler-rt/test/profile/instrprof-thinlto-indirect-call-promotion.cpp` This patch changes `GlobalValues::getGlobalIdentifer` to use the semicolon. To elaborate on the scenario how things break without this PR 1. IRPGO raw profiles stores (compressed) IRPGO names of functions in one section, and per-function profile data in another section. The [NameRef](fc715e4cd9/compiler-rt/include/profile/InstrProfData.inc (L72)) field in per-function profile data is the MD5 hash of IRPGO names. 2. When raw profiles are converted to indexed format profiles, the profiled address is [mapped](fc715e4cd9/llvm/lib/ProfileData/InstrProf.cpp (L876-L885)) to the MD5 hash of the callee. 3. In `pgo-instr-use` thin-lto prelink pipeline, MD5 hash of IRPGO names will be [annotated](fc715e4cd9/llvm/lib/Transforms/Instrumentation/PGOInstrumentation.cpp (L1707)) as value profiles, and used to import indirect-call-prom candidates. If the annotated MD5 hash is computed from the new format while import uses the prior format, the callee cannot be imported. *`compiler-rt/test/profile/instrprof-thinlto-indirect-call-promotion.cpp` is added to have an end-to-end test. * `llvm/test/Transforms/PGOProfile/thinlto_indirect_call_promotion.ll` is updated to have better test coverage from another aspect (as runtime tests are more sensitive to the environment and may be skipped by some contributors)
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================