Is SCYL_EXTERNAL working for ESIMD function?

[youfengwu]

According the the ESIMD spec, the following should work:
SYCL_EXTERNAL
void sycl_device_f(sycl::global_ptr ptr, sycl::intel::gpu::simd<float, 8> X) [[intel::sycl_explicit_simd]] {
sycl::intel::gpu::flat_block_write(*ptr.get(), X);
}

Somehow the following failed compilation:
SYCL_EXTERNAL
simd<float,VL> doVadd(simd<float,VL> va, simd<float,VL> vb) [[intel::sycl_explicit_simd]] {
simd<float, VL> vc = va + vb;
return vc;
}

% clang++ -o launch -O2 -std=c++17 -fsycl -I ../../SYCL/ESIMD ../call_vadd_1d_esimd_extern.cpp
../call_vadd_1d_esimd_extern.cpp:27:63: error: 'sycl_explicit_simd' attribute cannot be applied to types
simd<float,VL> doVadd(simd<float,VL> va, simd<float,VL> vb) [[intel::sycl_explicit_simd]] {

Will appreciate any suggestions.
Thanks.

[AGindinson]

@kbobrovs, @DenisBakhvalov, could you please take a look? Should this be converted to an issue?

[kbobrovs]

There are lots of problems with this example. Some are caused by outdated spec - we have an internal tracker already to fix it. It also exposes a problem - global_ptr::get() produces __global float* which isn't accepted by esimd intrinsics - not covered by any internal tracker on this. Please let me know if you'll create one.

This code below compiles fine:

#include <CL/sycl.hpp>
#include <sycl/ext/intel/experimental/esimd.hpp>

using namespace sycl::ext::intel::experimental::esimd;

SYCL_EXTERNAL
void sycl_device_f(sycl::global_ptr<float> ptr, simd<float, 8> X) SYCL_ESIMD_FUNCTION {
  block_store(reinterpret_cast<float*>(ptr.get()), X);
}

[kbobrovs]

BTW, simd::copy_to works fine with sycl::global_ptr in place of the pointer argument.