[PATCH] D100739: [Coroutines] Handle overaligned frame allocation (2)

[Yuanfang Chen via Phabricator via cfe-commits]

ychen added inline comments.


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Comment at: clang/docs/LanguageExtensions.rst:2689
 
-  size_t __builtin_coro_size()
+  size_t __builtin_coro_size(bool alloc)
   void  *__builtin_coro_frame()
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ChuanqiXu wrote:
> ychen wrote:
> > lxfind wrote:
> > > Do we need to change __builtin_coro_size? The argument will always be 1, right?
> > > It only starts to change in LLVM intrinsics, if I read the impl correctly.
> > Yeah, It is always 1 for Clang until the spec is fixed (then we could revert it back to 0).  Other clients using `__builtin_coro_size` may use 0 if the client doesn't care about overaligned frame or it could handle overaligned frame by itself. 
> BTW, is it OK to edit the `builtin`s directly? Since builtin is different with intrinsic which is only visible in the internal of compiler, builtin could be used by any end users. Although I know there should be  little users who would use `__builtin_coro` APIs, I worry if there is any guide principle for editing the `builtin`s.
> BTW, is it OK to edit the builtins directly? Since builtin is different with intrinsic which is only visible in the internal of compiler, builtin could be used by any end users. Although I know there should be little users who would use __builtin_coro APIs, I worry if there is any guide principle for editing the builtins.

I think it is ok to change these if it is justified like anything else.

builtins/intrinsics are interfaces on different levels. I'm trying to make __builtin_coro_size consistent with llvm.coro.size because I don't have a good reason for not doing that. (assume that we keep this opt-in overaligned frame handling in LLVM even after the spec is fixed since it helps solve a practical problem and the maintenance cost is low)




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  https://reviews.llvm.org/D100739/new/

https://reviews.llvm.org/D100739