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[libc++][mdspan] Fix layout_left::stride(r)

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It was using the stride calculation of layout_right.

Reviewed By: philnik

Differential Revision: https://reviews.llvm.org/D157065
This commit is contained in:
Christian Trott 2023-08-03 21:35:23 -06:00
parent 9f4a2a8636
commit 0f4d7d81c9
2 changed files with 3 additions and 3 deletions
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2
libcxx/include/__mdspan/layout_left.h
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@ -164,7 +164,7 @@ public:
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
__r < extents_type::rank(), "layout_left::mapping::stride(): invalid rank index");
index_type __s = 1;
for (rank_type __i = extents_type::rank() - 1; __i > __r; __i--)
for (rank_type __i = 0; __i < __r; __i++)
__s *= __extents_.extent(__i);
return __s;
}

4
libcxx/test/std/containers/views/mdspan/layout_left/stride.pass.cpp
View File

@ -39,8 +39,8 @@ constexpr bool test() {
constexpr size_t D = std::dynamic_extent;
test_stride<std::extents<unsigned, D>>(std::array<unsigned, 1>{1}, 7);
test_stride<std::extents<unsigned, 7>>(std::array<unsigned, 1>{1});
test_stride<std::extents<unsigned, 7, 8>>(std::array<unsigned, 2>{8, 1});
test_stride<std::extents<int64_t, D, 8, D, D>>(std::array<int64_t, 4>{720, 90, 10, 1}, 7, 9, 10);
test_stride<std::extents<unsigned, 7, 8>>(std::array<unsigned, 2>{1, 7});
test_stride<std::extents<int64_t, D, 8, D, D>>(std::array<int64_t, 4>{1, 7, 56, 504}, 7, 9, 10);
return true;
}