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+! Copyright 2019 Wojciech Kosior
+  
+! This is free and unencumbered software released into the public domain.
+
+! Anyone is free to copy, modify, publish, use, compile, sell, or
+! distribute this software, either in source code form or as a compiled
+! binary, for any purpose, commercial or non-commercial, and by any
+! means.
+
+! In jurisdictions that recognize copyright laws, the author or authors
+! of this software dedicate any and all copyright interest in the
+! software to the public domain. We make this dedication for the benefit
+! of the public at large and to the detriment of our heirs and
+! successors. We intend this dedication to be an overt act of
+! relinquishment in perpetuity of all present and future rights to this
+! software under copyright law.
+
+! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+! EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+! MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+! IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+! OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+! ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+! OTHER DEALINGS IN THE SOFTWARE.
+
+! For more information, please refer to <http://unlicense.org/>
+
+MODULE bettmat2
+  IMPLICIT none
+  PRIVATE
+
+  PUBLIC :: bett2mull
+  PRIVATE :: bett2mull_4, bett2mull_8, bett2mull_16
+  
+  INTERFACE bett2mull
+     procedure bett2mull_4, bett2mull_8, bett2mull_16
+  END INTERFACE bett2mull
+
+CONTAINS
+
+  FUNCTION bett2mull_4(A, B) result(C)
+    IMPLICIT none
+    real(kind=4), intent(in), dimension(1:,1:) :: A, B
+    real(kind=4), dimension(size(A, 1), size(B, 2)) :: C
+    integer :: i, j, k
+
+    C = 0
+    
+    DO j = 1, size(B, 2)
+       DO k = 1, size(A, 2)
+
+          C(:,j) = C(:,j) + A(:,j) * B(k,j)
+       END DO
+    END DO
+    
+  END FUNCTION bett2mull_4
+  
+  FUNCTION bett2mull_8(A, B) result(C)
+    IMPLICIT none
+    real(kind=8), intent(in), dimension(1:,1:) :: A, B
+    real(kind=8), dimension(size(A, 1), size(B, 2)) :: C
+    integer :: i, j, k
+
+    C = 0
+    
+    DO j = 1, size(B, 2)
+       DO k = 1, size(A, 2)
+
+          C(:,j) = C(:,j) + A(:,j) * B(k,j)
+       END DO
+    END DO
+    
+  END FUNCTION bett2mull_8
+  
+  FUNCTION bett2mull_16(A, B) result(C)
+    IMPLICIT none
+    real(kind=16), intent(in), dimension(1:,1:) :: A, B
+    real(kind=16), dimension(size(A, 1), size(B, 2)) :: C
+    integer :: i, j, k
+
+    C = 0
+    
+    DO j = 1, size(B, 2)
+       DO k = 1, size(A, 2)
+
+          C(:,j) = C(:,j) + A(:,j) * B(k,j)
+       END DO
+    END DO
+    
+  END FUNCTION bett2mull_16
+  
+END MODULE bettmat2