Make FixedKernelLayout internal

PiperOrigin-RevId: 317381358

1 files changed, 13 insertions, 0 deletions

diff --git a/ruy/matrix.h b/ruy/matrix.h
index cb2e4d6..65ba1b4 100644
--- a/ruy/matrix.h
+++ b/ruy/matrix.h
@@ -184,6 +184,19 @@ StreamType& operator<<(StreamType& stream, const Matrix<Scalar>& mat) {
   return stream;
 }
 
+// Compile-time version of KernelLayout, used to declare kernel layouts in a
+// way that can be consumed by compile-time logic.
+// See how partial specializations of Kernel use it to declare their layouts.
+// The only reason why this is currently part of the public API is to
+// allow testing various layouts for the Path::kStandardCpp kernel, as a
+// testing-only feature. See MulParamsType::StandardCppKernelLhsLayout.
+template <Order tOrder, int tRows, int tCols>
+struct FixedKernelLayout {
+  static constexpr Order kOrder = tOrder;
+  static constexpr int kRows = tRows;
+  static constexpr int kCols = tCols;
+};
+
 #if (__cplusplus < 201703L)
 // A static constexpr data member is automatically inline and should not require
 // redeclaration without an initializer. This is actually deprecated from C++17