https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65697
--- Comment #46 from mwahab at gcc dot gnu.org --- (In reply to James Greenhalgh from comment #45) > (In reply to mwahab from comment #44) > > And this final sentence is buggy by omission of a mention of memory writes: > > but following memory reads are not prevented from being speculated to > before the barrier. > > Which can be read as forbidding store-store reordering across the barrier. It doesn't say anything about store-store reordering so it's trumped by the stated intention to be compatible with the psABI. > As I say though, I think this is an artefact of transcribing the > documentation, rather than an attempt to provide stronger ordering semantics > in the GCC implementation. Agreed.
