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(For example, AMD Zen cores have 168 64-bit integer and 160 128-bit vector floating-point physical internal registers.); Additional XMM (SSE) registers
: Similarly, the number of 128-bit XMM registers (used for Streaming SIMD instructions) is also increased from 8 to 16.
: The traditional x87 FPU register stack is not included in the register file size extension in 64-bit mode, compared with the XMM registers used by SSE2, which did get extended. The x87 register

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