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Additional info for Communications of ACM , vol 54 issue 4 - April 2011
The JIT compiler must run at a near real-time pace and, therefore, cannot spend a lot of time finding an optimal SIMD mapping at runtime. 11 Many complex applications are not transformed well into parallel SIMD code by optimizing compilers. We argue that the developer often knows which operations can be executed in parallel and should be able to code them in a standardized fashion that will utilize the available SIMD functionality. The user knows that the source and destination of the operation are arrays of the same type and length, and this type of operation is most beneficial when sequences of SIMD operations can be chained together, avoiding transfers between the SIMD and main CPU register files.
The user knows that the source and destination of the operation are arrays of the same type and length, and this type of operation is most beneficial when sequences of SIMD operations can be chained together, avoiding transfers between the SIMD and main CPU register files. Another source of resistance that we have heard from industry and research personnel concerns the possibility of using a dedicated graphics card for GPGPU (general-purpose computing on graphics processing units). Examples of this technology are Nvidia’s CUDA and ATI’s STREAM.
Virtual machines and interpreted languages have consistently abstracted and moved away from the underlying system architecture. SIMD instructions were added to modern processors to increase instruction-level parallelism. In a SIMD instruction, multiple and unique data elements can be manipulated with one common operation. SIMD units typically include an additional register bank with a large register width. These individual registers can be subdivided to hold multiple data elements of varying data types.