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How many XMM registers are available on an x86 processor supporting SSE?

How to find out the number of XMM registers on a processor that supports SSE?

In the Intel X5550, for example.

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The number of XMM registers is fixed in all processors that support SSE. If the CPU is in 32-bit mode, you can use 8 registers from xmm0to xmm7, and if in 64-bit mode you can specify 16 registers, starting from xmm0to xmm15, This is due to the use of the prefix REX.W.

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