https://bugs.llvm.org/show_bug.cgi?id=33146
Bug ID: 33146
Summary: __GCC_ATOMIC_SHORT_LOCK_FREE defined incorrectly for
WebAssembly
Product: clang
Version: unspecified
Hardware: Other
OS: other
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: dan433...@gmail.com
CC: dsch...@google.com, jgrave...@google.com,
llvm-bugs@lists.llvm.org
8-bit and 16-bit atomics in the proposed WebAssembly memory model are not
guaranteed to be lock-free, even though 32-bit atomics are.
clang currently defines __GCC_ATOMIC_SHORT_LOCK_FREE and others to be 2, which
is incorrect; with current WebAssembly shared memory proposal, they should be
1.
A patch to implement this in clang is here: https://reviews.llvm.org/D31516
The WebAssembly memory model proposal is here:
https://github.com/WebAssembly/threads
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