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| author | Pavel Iliin <Pavel.Iliin@arm.com> | 2021-02-25 22:51:09 +0000 |
|---|---|---|
| committer | Pavel Iliin <Pavel.Iliin@arm.com> | 2021-03-01 17:36:24 +0000 |
| commit | 98f06b16a313ece593f5711778d7da9037f3a2ef (patch) | |
| tree | 07818cf66f4ccac752eaa2edb9073b86de720d28 | |
| parent | e0e6b1e39e7e402cd74a8bf98a2728efbe38310e (diff) | |
| download | llvm-98f06b16a313ece593f5711778d7da9037f3a2ef.zip llvm-98f06b16a313ece593f5711778d7da9037f3a2ef.tar.gz llvm-98f06b16a313ece593f5711778d7da9037f3a2ef.tar.bz2 | |
[AArch64][Docs] Release notes 12.x on outline atomics
Description for AArch64 -moutline-atomics, -mno-outline-atomics
options added to release notes.
Differential Revision: https://reviews.llvm.org/D97510
| -rw-r--r-- | clang/docs/ReleaseNotes.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index a43cc33..64f737f 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -73,6 +73,15 @@ New Compiler Flags - ... +- AArch64 options ``-moutline-atomics``, ``-mno-outline-atomics`` to enable + and disable calls to helper functions implementing atomic operations. These + out-of-line helpers like '__aarch64_cas8_relax' will detect at runtime + AArch64 Large System Extensions (LSE) availability and either use their + atomic instructions, or falls back to LL/SC loop. These options do not apply + if the compilation target supports LSE. Atomic instructions are used directly + in that case. The option's behaviour mirrors GCC, the helpers are implemented + both in compiler-rt and libgcc. + - -fpch-codegen and -fpch-debuginfo generate shared code and/or debuginfo for contents of a precompiled header in a separate object file. This object file needs to be linked in, but its contents do not need to be generated |