In a 256-bit register you can fit 8 SP numbers or 4 DP numbers. ![]() Well that means that you can pack twice the amount of SP data in a register. Usually vector stuff is such that there will be a 256-bit or 128-bit register that you load up with multiple smaller pieces of data and then run math on. Where I suppose it could make a difference, in theory, is something that is highly vectorized. For regular SSE instructions I imagine that modern CPUs are the same for SP or DP. ![]() The newer the CPU, the more powerful they are at double precision (64-bit) floating point in general. I imagine it would be little difference, and it would probably also depend on the CPU.
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