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[SYCL][ESIMD] Fix compile-time evaluated functions, add test. #2161

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Merged
merged 1 commit into from
Jul 23, 2020
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[SYCL][ESIMD] Fix compile-time evaluated functions, add test. #2161

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4 changes: 2 additions & 2 deletions sycl/include/CL/sycl/intel/esimd/detail/esimd_util.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,11 +31,11 @@ template <unsigned int N, unsigned int K> struct NextPowerOf2<N, K, false> {
}
};

template <unsigned int N> unsigned int getNextPowerOf2() {
template <unsigned int N> constexpr unsigned int getNextPowerOf2() {
return NextPowerOf2<N, 1, (1 >= N)>::get();
}

template <> unsigned int getNextPowerOf2<0>() { return 0; }
template <> constexpr unsigned int getNextPowerOf2<0>() { return 0; }

/// Compute binary logarithm of a constexpr with guaranteed compile-time
/// evaluation.
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15 changes: 15 additions & 0 deletions sycl/test/regression/esimd-util-compiler-eval.cpp
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@@ -0,0 +1,15 @@
// RUN: %clangxx -fsycl -fsycl-explicit-simd -fsycl-device-only -c %s
// This test checks compile-time evaluation of functions from esimd_util.hpp

#include "CL/sycl.hpp"
#include "CL/sycl/intel/esimd/esimd.hpp"

static_assert(__esimd::getNextPowerOf2<0>() == 0, "");
static_assert(__esimd::getNextPowerOf2<1>() == 1, "");
static_assert(__esimd::getNextPowerOf2<7>() == 8, "");
static_assert(__esimd::getNextPowerOf2<1024>() == 1024, "");

static_assert(__esimd::log2<0>() == 0, "");
static_assert(__esimd::log2<1>() == 0, "");
static_assert(__esimd::log2<7>() == 2, "");
static_assert(__esimd::log2<1024 * 1024>() == 20, "");