jyu2 added inline comments.
================
Comment at: clang/lib/Sema/Sema.cpp:241
+ (Context.getAuxTargetInfo() &&
+ Context.getAuxTargetInfo()->hasInt128Type())) {
// If either of the 128-bit integer types are unavailable to name lookup,
----------------
jyu2 wrote:
> jdoerfert wrote:
> > jyu2 wrote:
> > > jdoerfert wrote:
> > > > I don't understand why this (and the changes below) are necessary. Host
> > > > and device compilation are separate. This should not be any different
> > > > to CUDA, HIP, or OpenMP offload which seem not to require this.
> > > As far as I can know, in real compile, the auxtarget should be also set
> > > for example SYCL. May be that is only for our compiler. I am not sure
> > > what do you mean by it should same with CUDA, HIP...? Do you mean,
> > > CUDA(or HIP...) target should also not support 128-bit integer? If so, I
> > > don't see any error emit for CUDA when I try with nvptx64-nvidia-cuda.
> > >
> > > Thanks.
> > >
> > I'm not saying auxtarget is not set. I'm trying to understand why this is
> > necessary. Why would you initialize `__int128_t` if your target doesn't
> > support it? What happens if you only include the SPIR.h change?
> Without this change you will see error:
>
> j3.c:2:15: error: unknown type name '__uint128_t'
> typedef const __uint128_t megeType;
>
> bash-4.4$ cat j3.c
>
> typedef const __uint128_t megeType;
>
> Without change in SemaOverload.c:
> you will see error:
> x.cpp:3:14: error: use of overloaded operator '==' is ambiguous (with operand
> types 'struct X' and '__int128')
> bool a = x == __int128(0);
> ~ ^ ~~~~~~~~~~~
>
> bash-4.4$ cat x.cpp
> namespace PR12964 {
> struct X { operator __int128() const; } x;
> bool a = x == __int128(0);
> }
>
>
>
Just one more point, the errors only need to be emitted for 128-bit integer
used inside device code. The test case above 128-bit integer is not used in
device code, so we don't want to emit error for it.
Thanks.
Jennifer
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D92439/new/
https://reviews.llvm.org/D92439
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