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[CuTe] [Fix] MSVC's inability to deduce a non-type parameter pack from a dependent template alias #3198

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[CuTe] [Fix] MSVC's inability to deduce a non-type parameter pack from a dependent template alias #3198

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e16e870
[CuTe] [Fix] MSVC's inability to deduce a non-type parameter pack fro…
SystemPanic Apr 30, 2026
d968159
Remove _MSC_VER guards
SystemPanic May 3, 2026
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22 changes: 15 additions & 7 deletions include/cute/stride.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -286,6 +286,20 @@ namespace detail {
template <class Major>
struct CompactLambda;

// Workaround for MSVC's inability to deduce a non-type parameter pack from a dependent template alias, causing error C3545.
template <class Major, class Shape>
struct CompactSeq;

template <class Shape>
struct CompactSeq<LayoutLeft, Shape> {
using type = tuple_seq<Shape>;
};

template <class Shape>
struct CompactSeq<LayoutRight, Shape> {
using type = tuple_rseq<Shape>;
};

// @pre is_integral<Current>
// Return (result, current * product(shape)) to enable recurrence
template <class Major, class Shape, class Current>
Expand All @@ -296,7 +310,7 @@ compact(Shape const& shape,
{
if constexpr (is_tuple<Shape>::value) { // Shape::tuple Current::int
using Lambda = CompactLambda<Major>; // Append or Prepend
using Seq = typename Lambda::template seq<Shape>; // Seq or RSeq
using Seq = typename CompactSeq<Major, Shape>::type; // Seq or RSeq
return cute::detail::fold(shape, cute::make_tuple(cute::make_tuple(), current), Lambda{}, Seq{});
} else { // Shape::int Current::int
if constexpr (is_constant<1, Shape>::value) {
Expand All @@ -319,9 +333,6 @@ struct CompactLambda<LayoutLeft>
auto result = detail::compact<LayoutLeft>(si, get<1>(init));
return cute::make_tuple(append(get<0>(init), get<0>(result)), get<1>(result)); // Append
}

template <class Shape>
using seq = tuple_seq<Shape>; // Seq
};

// For GCC8.5 -- Specialization LayoutRight
Expand All @@ -334,9 +345,6 @@ struct CompactLambda<LayoutRight>
auto result = detail::compact<LayoutRight>(si, get<1>(init));
return cute::make_tuple(prepend(get<0>(init), get<0>(result)), get<1>(result)); // Prepend
}

template <class Shape>
using seq = tuple_rseq<Shape>; // RSeq
};

} // end namespace detail
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