[PATCH] D97510: [AArch64][Docs] Release notes 12.x on outline atomics
Pavel Iliin via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Thu Feb 25 16:16:22 PST 2021
ilinpv updated this revision to Diff 326550.
ilinpv added a comment.
Fixing typos
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D97510/new/
https://reviews.llvm.org/D97510
Files:
clang/docs/ReleaseNotes.rst
Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -73,6 +73,15 @@
- ...
+- 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 fall back to LL/SC loop. These options do not apply,
+ if compilation target supports LSE. Atomic instructions are used directly in
+ that case. The options 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
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