yaxunl marked 3 inline comments as done.
yaxunl added inline comments.
================
Comment at: lib/Sema/SemaOverload.cpp:1492
+ Changed = true;
+ }
+
----------------
rjmccall wrote:
> It's cheaper not to check the CUDA language mode here; pulling the CC out of
> the FPT is easy.
>
> Why is this necessary, anyway? From the spec, it doesn't look to me like
> kernel function pointers can be converted to ordinary function pointers. A
> kernel function pointer is supposed to be declared with something like
> `__global__ void (*fn)(void)`. You'll need to change your patch to SemaType
> to apply the CC even when compiling for the host, of course.
>
> I was going to say that you should use this CC in your validation that calls
> with execution configurations go to kernel functions, but... I can't actually
> find where you do that validation.
>
> Do you need these function pointers to be a different size from the host
> function pointer?
In CUDA, `__global__` can only be used with function declaration or definition.
Using it in function pointer declaration will result in a warning: 'global'
attribute only applies to functions.
Also, there is this lit test in SemaCUDA:
```
__global__ void kernel() {}
typedef void (*fn_ptr_t)();
__host__ fn_ptr_t get_ptr_h() {
return kernel;
}
```
It allows implicit conversion of `__global__ void()` to void(*)(), therefore I
need the above change to drop the CUDA kernel calling convention in such
implicit conversion.
https://reviews.llvm.org/D44747
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