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[SYCL][E2E] Zero refC before matrix_multiply_ref in fill_k_cache tests #22995

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[SYCL][E2E] Zero refC before matrix_multiply_ref in fill_k_cache tests #22995

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3 changes: 3 additions & 0 deletions sycl/test-e2e/Matrix/Inputs/joint_matrix_bf16_fill_k_cache_impl.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -390,6 +390,9 @@ void test(size_t matrix_size_input) {

matrix_rand<T>(matrix_size, matrix_size, A, T(1));
matrix_rand<T>(matrix_size, matrix_size, B, T(1));
// matrix_multiply_ref accumulates into refC, so it must be zeroed first:
// USM allocations are not guaranteed to be zero initialized.
matrix_fill(matrix_size, matrix_size, refC, TResult(0));

matrix_multiply_ref<T, T, TResult, 1>(
A, B, refC, matrix_size, matrix_size, matrix_size
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