[Build] Explicitly link to cublasLt if it exists (#4776)

* Explicitly link to cublasLt

* Only link cublasLt if it's found

Co-authored-by: Jon Soifer <jonso@microsoft.com>

cmake/modules/CUDA.cmake

@@ -50,6 +50,9 @@ if(USE_CUDA)
     file(GLOB CONTRIB_CUBLAS_SRCS src/runtime/contrib/cublas/*.cc)
     list(APPEND RUNTIME_SRCS ${CONTRIB_CUBLAS_SRCS})
     list(APPEND TVM_RUNTIME_LINKER_LIBS ${CUDA_CUBLAS_LIBRARY})
+    if(NOT CUDA_CUBLASLT_LIBRARY STREQUAL "CUDA_CUBLASLT_LIBRARY-NOTFOUND")
+      list(APPEND TVM_RUNTIME_LINKER_LIBS ${CUDA_CUBLASLT_LIBRARY})
+    endif()
   endif(USE_CUBLAS)
 
 else(USE_CUDA)

cmake/util/FindCUDA.cmake

@@ -70,6 +70,9 @@ macro(find_cuda use_cuda)
       find_library(CUDA_CUBLAS_LIBRARY cublas
         ${CUDA_TOOLKIT_ROOT_DIR}/lib/x64
         ${CUDA_TOOLKIT_ROOT_DIR}/lib/Win32)
+      find_library(CUDA_CUBLASLT_LIBRARY cublaslt
+        ${CUDA_TOOLKIT_ROOT_DIR}/lib/x64
+        ${CUDA_TOOLKIT_ROOT_DIR}/lib/Win32)
     else(MSVC)
       find_library(_CUDA_CUDA_LIBRARY cuda
         PATHS ${CUDA_TOOLKIT_ROOT_DIR}
@@ -88,6 +91,9 @@ macro(find_cuda use_cuda)
       find_library(CUDA_CUBLAS_LIBRARY cublas
         ${CUDA_TOOLKIT_ROOT_DIR}/lib64
         ${CUDA_TOOLKIT_ROOT_DIR}/lib)
+      find_library(CUDA_CUBLASLT_LIBRARY cublaslt
+        ${CUDA_TOOLKIT_ROOT_DIR}/lib64
+        ${CUDA_TOOLKIT_ROOT_DIR}/lib)
     endif(MSVC)
     message(STATUS "Found CUDA_TOOLKIT_ROOT_DIR=" ${CUDA_TOOLKIT_ROOT_DIR})
     message(STATUS "Found CUDA_CUDA_LIBRARY=" ${CUDA_CUDA_LIBRARY})
@@ -95,5 +101,6 @@ macro(find_cuda use_cuda)
     message(STATUS "Found CUDA_NVRTC_LIBRARY=" ${CUDA_NVRTC_LIBRARY})
     message(STATUS "Found CUDA_CUDNN_LIBRARY=" ${CUDA_CUDNN_LIBRARY})
     message(STATUS "Found CUDA_CUBLAS_LIBRARY=" ${CUDA_CUBLAS_LIBRARY})
+    message(STATUS "Found CUDA_CUBLASLT_LIBRARY=" ${CUDA_CUBLASLT_LIBRARY})
   endif(CUDA_FOUND)
 endmacro(find_cuda)