topic CRC32 implementation on Sandy Bridge in Intel® Moderncode for Parallel Architectures https://community.intel.com/t5/Intel-Moderncode-for-Parallel/CRC32-implementation-on-Sandy-Bridge/m-p/811289#M1008 On Nehalem the SSE4.2 CRC32 instruction is executed on the ALU that handles complex integer, dispatched through port 1. This is also the port through which Floating Point addition is dispatched. Is this still the case for Sandy Bridge? In the following micro-architectural diagram there is no distinction between the ALUs on ports 0,1, and 5:<DIV></DIV><DIV><A href="http://www.hardwaresecrets.com/fullimage.php?image=30986" target="_blank">http://www.hardwaresecrets.com/fullimage.php?image=30986</A></DIV><DIV></DIV><DIV>Is it still the case that only the ALU on port-1 can execute CRC32?</DIV> Tue, 01 Feb 2011 08:25:06 GMT amdn 2011-02-01T08:25:06Z CRC32 implementation on Sandy Bridge https://community.intel.com/t5/Intel-Moderncode-for-Parallel/CRC32-implementation-on-Sandy-Bridge/m-p/811289#M1008 On Nehalem the SSE4.2 CRC32 instruction is executed on the ALU that handles complex integer, dispatched through port 1. This is also the port through which Floating Point addition is dispatched. Is this still the case for Sandy Bridge? In the following micro-architectural diagram there is no distinction between the ALUs on ports 0,1, and 5:<DIV></DIV><DIV><A href="http://www.hardwaresecrets.com/fullimage.php?image=30986" target="_blank">http://www.hardwaresecrets.com/fullimage.php?image=30986</A></DIV><DIV></DIV><DIV>Is it still the case that only the ALU on port-1 can execute CRC32?</DIV> Tue, 01 Feb 2011 08:25:06 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/CRC32-implementation-on-Sandy-Bridge/m-p/811289#M1008 amdn 2011-02-01T08:25:06Z CRC32 implementation on Sandy Bridge https://community.intel.com/t5/Intel-Moderncode-for-Parallel/CRC32-implementation-on-Sandy-Bridge/m-p/811290#M1009 You can find a description of the Sandy Bridge execution ports in 2.1.4 of the updated <A href="http://www.intel.com/Assets/PDF/manual/248966.pdf">Intel 64 and IA-32 Architectures Optimization Reference Manual</A>. It still lists integer multiplication and FP addition on port 1. Mon, 14 Feb 2011 20:39:20 GMT https://community.intel.com/t5/Intel-Moderncode-for-Parallel/CRC32-implementation-on-Sandy-Bridge/m-p/811290#M1009 Thomas_W_Intel 2011-02-14T20:39:20Z