ormris added a comment. I've done testing with the following global parameters.
- The base for the branch is llvmorg-10-init-8655-g94a4a2c97f8 - Used llvm, clang, lld, and llvm-ar from this branch. - The sqlite kvtest program was the test payload. This test compared an unmodified compiler from the base of the branch with a modified compiler with this patch applied and the loop optimisation passes mentioned above moved to the backend. The results were as follows. All numbers in seconds. | Run | Modified LTO | Modified SPGO+LTO | Unmodified SPGO+LTO | | ---- | ------------ | ----------------- | ------------------- | | 1 | 42.00 | 41.73 | 42.08 | | 2 | 42.30 | 39.49 | 42.45 | | 3 | 41.21 | 42.46 | 42.49 | | AVG: | 41.84 | 41.23 | 42.34 | | TL;DR the average run using a compiler built with the modified SPGO pipeline is about a second faster. Definitely a positive initial result. In D69732#1730732 <https://reviews.llvm.org/D69732#1730732>, @tejohnson wrote: > This probably needs to be taken over by someone who cares about full LTO > performance (@wristow or @ormris ?). This patch was some cleanup of the full > LTO sample PGO pipeline, but has a number of issues I enumerate in the > summary. Given the performance improvements here, I'd like to develop this patch further. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D69732/new/ https://reviews.llvm.org/D69732 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
