sync-implicit-seq_cst.c - OpenGrok history log for /llvm-project-15.0.7/clang/test/Sema/sync-implicit-seq

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# e77b48b0	10-Sep-2018	JF Bastien <[email protected]>	Implement -Watomic-implicit-seq-cst Summary: _Atomic and __sync_* operations are implicitly sequentially-consistent. Some codebases want to force explicit usage of memory order instead. This warning Implement -Watomic-implicit-seq-cst Summary: _Atomic and __sync_* operations are implicitly sequentially-consistent. Some codebases want to force explicit usage of memory order instead. This warning allows them to know where implicit sequentially-consistent memory order is used. The warning isn't on by default because _Atomic was purposefully designed to have seq_cst as the default: the idea was that it's the right thing to use most of the time. This warning allows developers who disagree to enforce explicit usage instead. A follow-up patch will take care of C++'s std::atomic. It'll be different enough from this patch that I think it should be separate: for C++ the atomic operations all have a memory order parameter (or two), but it's defaulted. I believe this warning should trigger when the default is used, but not when seq_cst is used explicitly (or implicitly as the failure order for cmpxchg). <rdar://problem/28172966> Reviewers: rjmccall Subscribers: dexonsmith, cfe-commits Differential Revision: https://reviews.llvm.org/D51084 llvm-svn: 341860 show more ...

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# e77b48b0

10-Sep-2018

JF Bastien <[email protected]>

Implement -Watomic-implicit-seq-cst

Summary:
_Atomic and __sync_* operations are implicitly sequentially-consistent. Some
codebases want to force explicit usage of memory order instead. This warning

Implement -Watomic-implicit-seq-cst

Summary:
_Atomic and __sync_* operations are implicitly sequentially-consistent. Some
codebases want to force explicit usage of memory order instead. This warning
allows them to know where implicit sequentially-consistent memory order is used.
The warning isn't on by default because _Atomic was purposefully designed to
have seq_cst as the default: the idea was that it's the right thing to use most
of the time. This warning allows developers who disagree to enforce explicit
usage instead.

A follow-up patch will take care of C++'s std::atomic. It'll be different enough
from this patch that I think it should be separate: for C++ the atomic
operations all have a memory order parameter (or two), but it's defaulted. I
believe this warning should trigger when the default is used, but not when
seq_cst is used explicitly (or implicitly as the failure order for cmpxchg).

<rdar://problem/28172966>

Reviewers: rjmccall

Subscribers: dexonsmith, cfe-commits

Differential Revision: https://reviews.llvm.org/D51084

llvm-svn: 341860