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Today's processors can achieve high-performance, but this requires extensive machine-specific hand tuning.
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Routines have a large design space w/many parameters
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blocking sizes, loop nesting permutations, loop unrolling depths, software pipelining strategies, register allocations, and instruction schedules.
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Complicated interactions with the increasingly sophisticated microarchitectures of new microprocessors.
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A few months ago no tuned BLAS for Pentium for Linux.
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Need for quick deployment of optimized routines.
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ATLAS - Automatic Tuned Linear Algebra Software
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