Developer Guide

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Single-Cycle Floating-Point Accumulator for Single Work-Item Kernels

Single work-item kernels that perform accumulation in a loop can leverage the single-cycle floating-point accumulator feature of the 
Intel® oneAPI DPC++/C++ Compiler
. The compiler searches for these kernel instances and attempts to map an accumulation that executes in a loop into the accumulator structure.
The compiler supports an accumulator that adds or subtracts a value. To leverage this feature, describe the accumulation in a way that allows the compiler to infer the accumulator, which must be part of a loop, must have an initial value of 0, and cannot be conditional.
The accumulator is available only on Intel® Arria® 10 devices.

Product and Performance Information

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Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804