[PATCH] D64289: [OpenMP] Fix 128-bit long double support on target

[Alexey Bataev via Phabricator via cfe-commits]

ABataev added inline comments.


================
Comment at: clang/lib/Sema/SemaOpenMP.cpp:1594
+       !Context.getTargetInfo().hasFloat128Type() &&
+       Context.getTargetInfo().getLongDoubleWidth() != 128) ||
       (Ty->isIntegerType() && Context.getTypeSize(Ty) == 128 &&
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jdenny wrote:
> ABataev wrote:
> > jdenny wrote:
> > > ABataev wrote:
> > > > Hmm, this look strange, at least. Seems to me, in this case the size of the long double is 128 bit (copied from the host), but device reports that it does not support 128 bit double. Seems to me, it is a problem with the device configuration. Why does the host translate long double to 128 bit fp, while the device translates it to 64 bit FP?
> > > Sorry, I think I've misunderstood what's happening here, and my fix is probably wrong.
> > > 
> > > For x86_64, the example from my patch summary fails as described there.  Does that work for you?
> > > 
> > > For powerpc64le, the reproducer I added to the test suite fails without this patch.  Shouldn't it succeed?
> > Still, seems to me like the problem with the device config, not the original check.
> > Still, seems to me like the problem with the device config, not the original check.
> 
> I'm not sure where to begin looking for that.  Can you point me in the right direction?  Thanks.
You need to understand why host and device report different size of the type. Check how the device is configured in lib/Basic/Targets


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D64289/new/

https://reviews.llvm.org/D64289