September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Registers
Intel-based processors have 8 XMM registers for use with SSE, which are named XMM0 to XMM7 on 32-bit platforms, and 16 XMM registers, named XMM0 to XMM15, on 64-bit platforms. It is important to note that only 8 XMM registers are available on 64-bit platforms while not in long mode.
The content of each of the XMM registers may be considered to be one of the types below:
- 16 bytes (which we saw in the AES-NI implementation)
- Eight 16-bit words
- Four 32-bit double words
- Four 32-bit single precision floating-point numbers (we will use the registers this way throughout the chapter)
- Two 64-bit quad words
- Two 64-bit double precision floating point numbers
SSE instructions are able to operate on the same parts of registers that are used ...
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