[PATCH] D124866: [CUDA][HIP] support __noinline__ as keyword

[Dan Liew via Phabricator via cfe-commits]

delcypher added inline comments.


================
Comment at: clang/lib/Basic/IdentifierTable.cpp:111
     KEYSYCL       = 0x1000000,
+    KEYCUDA       = 0x2000000,
     KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX20,
----------------
yaxunl wrote:
> delcypher wrote:
> > @yaxunl Is it intentional that you didn't update `KEYALL` here? That means `KEYALL` doesn't include the bit for `KEYCUDA`.
> > 
> > If that was your intention then this will break if someone adds a new key. E.g.
> > 
> > ```
> > KEYCUDA = 0x2000000,
> > KEYSOMENEWTHING = 0x4000000,
> > // ...
> > // KEYALL now includes `KEYCUDA`, whereas it didn't before.
> > // KEYALL includes KEYSOMENEWTHING 
> > KEYALL = (0x7ffffff & ~KEYNOMS18 &
> >               ~KEYNOOPENCL) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
> > ...
> > ```
> > 
> > 
> > 1. Updating the `0x1ffffff` constant to `0x3ffffff` so that `KEYALL` includes `KEYCUDA`
> > 2. If your intention **is** to not have `KEYCUDA`  set in `KEYALL` then amend `KEYALL` to be.
> > 
> > ```
> > KEYALL = (0x7ffffff & ~KEYNOMS18 &
> >               ~KEYNOOPENCL & ~KEYCUDA ) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
> > // KEYCUDA is not included in KEYALL
> > ```
> My intention is not to include KEYCUDA in KEYALL.
> 
> Should I change KEYALL to
> 
> 
> ```
> KEYALL = (0x3ffffff & ~KEYNOMS18 &
>               ~KEYNOOPENCL & ~KEYCUDA ) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
> // KEYCUDA is not included in KEYALL
> ```
> 
> instead of 
> 
> 
> ```
> KEYALL = (0x7ffffff & ~KEYNOMS18 &
>               ~KEYNOOPENCL & ~KEYCUDA ) // KEYNOMS18 and KEYNOOPENCL are used to exclude.
> // KEYCUDA is not included in KEYALL
> ```
> 
> since the current maximum mask is 0x3ffffff instead of 0x7ffffff
Oops, you're right it would be `0x3ffffff`. I wonder though if we should clean this up so we don't need to manually update the bit mask every time... what if it was written like this?

```lang=c++
 enum {
    KEYC99        = 0x1,
    KEYCXX        = 0x2,
    KEYCXX11      = 0x4,
    ....
    KEYSYCL       = 0x1000000,
    KEYCUDA       = 0x2000000,
    KEYMAX = KEYCUDA, // Must be set to the largest KEY enum value
    KEYALLCXX = KEYCXX | KEYCXX11 | KEYCXX20,

    // KEYNOMS18 and KEYNOOPENCL are used to exclude.
    // KEYCUDA is not included in KEYALL because <FIXME add reason here>
    KEYALL = (((KEYMAX & (KEYMAX-1)) & ~KEYNOMS18 & ~KEYNOOPENCL & ~KEYCUDA)
};
```


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D124866/new/

https://reviews.llvm.org/D124866