https://llvm.org/bugs/show_bug.cgi?id=27168
Bug ID: 27168
Summary: atomicrmw and cmpxchg should support align attribute
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Core LLVM classes
Assignee: unassignedb...@nondot.org
Reporter: jykni...@google.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Currently, atomic load/store instructions support an align attribute, and
require that it be specified (you can't use the default ABI alignment like with
non-atomic load/store). On the other hand, cmpxchg and atomicrmw don't support
an align attribute at all. They just assume the pointer has natural alignment.
I'd like to be able to specify alignment for atomicrmw and cmpxchg, and,
further, I think it should be required just like atomic load/store. This will
make the atomic ops be consistent, but more importantly, will let clang lower
even unaligned atomics access to llvm IR (which is part of my long-term plan
for atomics cleanup).
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