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Limits to ILP

Limits to ILP. Conflicting studies of amount Benchmarks (vectorized Fortran FP vs. integer C programs) Hardware sophistication Compiler sophistication How much ILP is available using existing mechanisms with increasing HW budgets? Do we need to invent new HW/SW mechanisms to keep on processor performance curve? Intel MMX, SSE (Streaming SIMD Extensions): 64 bit ints Intel SSE2: 128 bit, including 2 64-bit Fl. Pt. per clock Motorola AltaVec: 128 bit ints and FPs Supersparc Multimedia ops, etc. 32. 2/23/2011. CS252-S11 lecture 10.

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