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Use __ldg on Scalar Read-only Data Stores #1795

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Use __ldg on Scalar Read-only Data Stores #1795

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5a1c7b5
Use __ldg on scalar read-only data stores
fthaler Jul 24, 2024
336ede4
Merge remote-tracking branch 'upstream/master' into data-store-ldg
fthaler Jul 24, 2024
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38 changes: 37 additions & 1 deletion include/gridtools/storage/sid.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,10 @@
#include "../meta.hpp"
#include "data_store.hpp"

#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 350
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see both comments in the other __ldg pr

#include "../common/cuda_type_traits.hpp"
#endif

namespace gridtools {
namespace storage {
namespace storage_sid_impl_ {
Expand All @@ -32,11 +36,43 @@ namespace gridtools {
return lhs;
}
};
template <class T>
struct const_ptr_wrapper {
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Should that better live somewhere in the sid module and possibly become the default also for simple_ptr_holder?

T const *m_val;

GT_FUNCTION constexpr const_ptr_wrapper(T const *val) : m_val(val) {}

GT_FUNCTION constexpr T operator*() const {
#if defined(__CUDA_ARCH__) && __CUDA_ARCH__ >= 350
if constexpr (is_texture_type<T>::value)
return __ldg(m_val);
#endif
return *m_val;
}
GT_FUNCTION constexpr const_ptr_wrapper &operator+=(int_t arg) {
m_val += arg;
return *this;
}
GT_FUNCTION constexpr const_ptr_wrapper &operator-=(int_t arg) {
m_val -= arg;
return *this;
}
friend GT_FUNCTION constexpr const_ptr_wrapper operator+(const_ptr_wrapper obj, int_t arg) {
return {obj.m_val + arg};
}
friend GT_FUNCTION constexpr const_ptr_wrapper operator-(const_ptr_wrapper obj, int_t arg) {
return {obj.m_val - arg};
}
};

template <class T>
struct ptr_holder {
T *m_val;
GT_FUNCTION constexpr T *operator()() const { return m_val; }
GT_FUNCTION constexpr std::
conditional_t<std::is_const_v<T>, const_ptr_wrapper<std::remove_const_t<T>>, T *>
operator()() const {
return m_val;
}

friend GT_FORCE_INLINE constexpr ptr_holder operator+(ptr_holder obj, int_t arg) {
return {obj.m_val + arg};
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