IGC 2.41.5: "Internal Compiler Error: Floating point exception" on a SPV_KHR_cooperative_matrix (SYCL joint_matrix, fp16 x fp16 -> fp32) kernel for mtl-u / arl-s / dg2 (a diagnostic expected)

// Minimal reproducer: a SYCL kernel that uses joint_matrix (fp16 x fp16 -> fp32, 8x16 . 16x16), compiled to SPIR-V by icpx,
// then compiled offline with ocloc for a GPU with no matrix hardware (Xe-LPG: -device mtl-u).
// Expected: a diagnostic ("matrix extensions are not supported on this device"). Observed: an internal compiler error.
//   icpx -fsycl -O2 -o repro repro.cpp
//   clang-offload-extract --stem=img repro
//   ocloc compile -spirv_input -file img.0 -device mtl-u     # crashes;  -device bmg-g31 compiles
#include <sycl/sycl.hpp>
#include <sycl/ext/oneapi/matrix/matrix.hpp>
namespace mat = sycl::ext::oneapi::experimental::matrix;
int main() {
    sycl::queue q;
    constexpr size_t TM = 8, TN = 16, TK = 16;
    sycl::half* A = sycl::malloc_shared<sycl::half>(TM * TK, q);
    sycl::half* B = sycl::malloc_shared<sycl::half>(TK * TN, q);
    float* C = sycl::malloc_shared<float>(TM * TN, q);
    for (size_t i = 0; i < TM * TK; ++i) A[i] = sycl::half(1.f);
    for (size_t i = 0; i < TK * TN; ++i) B[i] = sycl::half(2.f);
    q.submit([&](sycl::handler& h) {
        sycl::local_accessor<sycl::half, 1> As(TM * TK, h), Bs(TK * TN, h);
        h.parallel_for(sycl::nd_range<1>(16, 16), [=](sycl::nd_item<1> it) [[sycl::reqd_sub_group_size(16)]] {
            const size_t l = it.get_local_id(0);
            for (size_t i = l; i < TM * TK; i += 16) As[i] = A[i];
            for (size_t i = l; i < TK * TN; i += 16) Bs[i] = B[i];
            sycl::group_barrier(it.get_group());
            auto sg = it.get_sub_group();
            mat::joint_matrix<sycl::sub_group, float, mat::use::accumulator, TM, TN> acc;
            mat::joint_matrix_fill(sg, acc, 0.0f);
            mat::joint_matrix<sycl::sub_group, sycl::half, mat::use::a, TM, TK, mat::layout::row_major> a;
            mat::joint_matrix<sycl::sub_group, sycl::half, mat::use::b, TK, TN, mat::layout::row_major> b;
            mat::joint_matrix_load(sg, a, As.get_multi_ptr<sycl::access::decorated::no>(), TK);
            mat::joint_matrix_load(sg, b, Bs.get_multi_ptr<sycl::access::decorated::no>(), TN);
            mat::joint_matrix_mad(sg, acc, a, b, acc);
            mat::joint_matrix_store(sg, acc, sycl::address_space_cast<sycl::access::address_space::global_space,
                                                                      sycl::access::decorated::no>(C), TN, mat::layout::row_major);
        });
    }).wait();
    return C[0] == 32.f ? 0 : 1;
}

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