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In a multicore CPU, does each core have access to it's own bank of XMM registers? For example if a chip is listed as having 16 XMM registers (XMM0-XMM15), is that 16 registers per core or 16 shared?
My understanding was that each core had its own register banks, and I would assume that the same goes for XMM registers, but I wasn't able to find a reference to back this assumption.
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There are eight XMM registers available in non -64-bit modes and 16 XMM registers in long mode, which allow simultaneous operations on: 16 bytes.
Yes, each core has its set of registers.
The NEON SIMD unit is 128-bit wide and includes 16 128-bit registers that can be used as 32 64-bit registers. These registers can be thought as vectors of elements of the same data type, being the data types signed/unsigned 8, 16, 32, 64-bit, and single precision floating point.
A multicore processors is basically a CPU that has several independent smaller processors inside. This is also referred to as Processor Count. Each core has its own ALU. FPU, registers, cache etc.
Yes, each core has its own registers.
It's worth noting that each core actually has on the order of a hundred physical registers; there are only 16 register names. This applies to both GPRs and XMM registers.
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