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Upstream Contributions

This page lists the upstream contributions, for some distro who want to use these features but use a stable version of the software, you can cherry-pick these commits to your own stable branch.

Bug fixes

GLIBC

  • ✅(Since 2.41)Fix IFUNC resolver cannot access gp pointer

    This is important for non-PIE binaries when IFUNC based function multi-version dispatching is used, such as in GCC with target_clones or target_version. Without this fix, FMV dispatching will crash when the function is called.

New features

GCC

  • ❓Add -ftarget-clones-table option support

    This patch adds support for the -ftarget-clones-table option in GCC, allowing specifying a table of target clones in a JSON file for every target. Thus we don't need to use target_clones attribute in the source code, which makes the source code cleaner and easier to maintain.

  • ❓Redirect to specific target based on TARGET_VERSION_COMPATIBLE

    To prevent the overhead from indirect function call which loads the pointer from GOT, this patch allows GCC to generate a direct call to the target version function if the target version is compatible with the current multi-versioning function. This is useful for performance-critical code that uses function multi-versioning and works well with LTO optimizations.

  • ✅(Since 15.0)RISC-V: Add Function Multi-Versioning support

    This allows GCC to use target_clones and target_version to generate function multi-version dispatching code.

LLVM