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AMD reveals info about Flex FP

Posted on Friday, October 29 2010 @ 18:15:38 CEST by

AMD director of product marketing John Fruehe blogged about Flex FP, the new floating point capabilities of the upcoming Bulldozer core. You can read his piece over here.
For those of you not familiar with floating point math, this is the high level stuff, not 1+1 integer math that most applications use. Technical applications and financial applications that rely on heavy-duty use of floating point math could see huge increases in performance over our existing architectures, as well as far more flexibility.

The heart of this new feature is a flexible floating point unit called the Flex FP. This is a single floating point unit that is shared between two integer cores in a module (so a 16-core “Interlagos” would have 8 Flex FP units). Each Flex FP has its own scheduler; it does not rely on the integer scheduler to schedule FP commands, nor does it take integer resources to schedule 256-bit executions. This helps to ensure that the FP unit stays full as floating point commands occur. Our competitors’ architectures have had single scheduler for both integer and floating point, which means that both integer and floating point commands are issued by a single shared scheduler vs. having dedicated schedulers for both integer and floating point executions.

There will be some instruction set extensions that include SSSE3, SSE 4.1 and 4.2, AVX, AES, FMA4, XOP, PCLMULQDQ and others.



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