koakuma added a comment. In D138532#3945422 <https://reviews.llvm.org/D138532#3945422>, @MaskRay wrote:
> I think we usually follow GCC instead of other targets. GCC enables it by default too, for example see https://godbolt.org/z/brPMKnM17 (That link also has comparison with clang with `-fomit-frame-pointer`/`-fno-omit-frame-pointer`) > I am unfamiliar with sparc. Can you show an example where > `-fomit-frame-pointer`/`-fno-omit-frame-pointer` demonstrate a codegen > difference? I tried some simple examples and cannot reproduce a difference. Unfortunately on SPARC, due to the register window mechanics this optimization can only be done on leaf functions. As for the concrete effects, it skips the `save` and `restore` instructions for register window management, which, among other things, does the saving/restoring of frame pointers, and changes the return instruction to `retl` (aka `jmp %o7+8`). Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D138532/new/ https://reviews.llvm.org/D138532 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
