How many sse registers are there

Asked 9 years, 7 months ago. Active 4 years, 10 months ago. Viewed 7k times. On Intel X, for example. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Is that so? Current Wikipedia says and this extension is duplicated in the Intel 64 architecture.

Could you rephrase it? How could we check whether xmm31 will be available or not? Or have I understood it incorrectly? You must've misunderstood the context. Operating System Support Instructions.

Using the Assembler Command Line. SSE instructions are divided into four subgroups:. SSE packed arithmetic instructions perform packed and scalar arithmetic operations on packed and scalar single-precision floating-point operands. The SEE compare instructions compare packed and scalar single-precision floating-point operands. These instructions take three parameters, arg1 an xmm register, arg2 an xmm or a bit memory location and IMM8 an 8-bit immediate control byte.

These instructions will perform arithmetic comparison between the packed contents of arg1 and arg2. The results of stage 1 and stage 2 of intermediate processing will be referred to as IntRes1 and IntRes2 respectively. Compares strings of implicit length and generates index in ECX. Compares strings of implicit length and generates a mask stored in XMM0. Compares strings of explicit length and generates index in ECX. Compares strings of explicit length and generates a mask stored in XMM0.

For more in-depth references take a look at the resources chapter of this book. These suffixes differentiate between different versions of the operation. The first letter describes whether the instruction should be P acked or S calar. Packed operations are applied to every member of the register, while scalar operations are applied to only the first value.

For example, in pseudo-code, a packed add would be executed as:. The second letter refers to the data size: either S ingle or D ouble. This simply tells the processor whether to use the register as four bit floats or two bit doubles, respectively.