[cfe-commits] [PATCH] Initial clang support for C++0x atomic operations

[John McCall]

On Sep 21, 2011, at 11:30 AM, Eli Friedman wrote:
> On Wed, Sep 21, 2011 at 10:39 AM, John McCall <rjmccall at apple.com> wrote:
>> On Sep 20, 2011, at 7:02 PM, Eli Friedman wrote:
>>> Attached.  Adds AtomicExpr nodes, creates them in Sema, and lowers
>>> them in IRGen.
>> 
>> Why is this a new expression node instead of a builtin call with custom
>> typechecking?
> 
> The return type of (most of) the builtins depends on the type of the
> first argument... can we model that without a new expression node?

Yes.  All the GCC atomic builtins are overloaded like this.  Just mark the
builtin as requiring custom type-checking.

There are also several builtins which take l-value operands, if that's important.

John.