improvements

Author: vmaksimo

llvm/docs/SPIRVUsage.rst

@@ -165,6 +165,8 @@ list of supported SPIR-V extensions, sorted alphabetically by their extension na
      - Adds decorations that can be applied to global (module scope) variables.
    * - ``SPV_INTEL_global_variable_fpga_decorations``
      - Adds decorations that can be applied to global (module scope) variables to help code generation for FPGA devices.
+   * - ``SPV_INTEL_media_block_io``
+     - Adds additional subgroup block read and write functionality that allow applications to flexibly specify the width and height of the block to read from or write to a 2D image.
    * - ``SPV_INTEL_optnone``
      - Adds OptNoneINTEL value for Function Control mask that indicates a request to not optimize the function.
    * - ``SPV_INTEL_split_barrier``