What does the "P" prefix stand for in the x86 instruction PCLMULQDQ?

In the Carry-less Multiplication x86 instruction, PCLMULQDQ, what does the "P" prefix stand for?

I've looked in these sources, but none of them explain the mnemonics.

• https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=clmul
• https://www.felixcloutier.com/x86/pclmulqdq
• https://en.wikipedia.org/wiki/CLMUL_instruction_set

Secondly, what does "QDQ" stand for?

P is for Packed (integer). All SSE/AVX integer instructions have mnemonics starting with p, like paddb. (Or vp for the AVX versions). As opposed to ...ps (packed-single) and ...pd packed-double instructions.

Q for Quad-word (64-bit) chunks of the source operand multiplying into a double-quad (128-bit) integer.

Related:

• https://stackoverflow.com/questions/39645078/what-comes-after-qword including meaning of mnemonics like punpcklqdq as an example of where dq is used instead of o (octword like scalar cqo), for interleaving 64-bit chunks to make a 128-bit, following the same pattern as punpcklwd (16 bit interleave).
• https://stackoverflow.com/questions/37308438/how-can-microsoft-say-the-size-of-a-word-in-winapi-is-16-bits the 8086 history of "word" being 16-bit in x86, not rewriting the documentation for 386 or x86-64. It gets baked into many mnemonics like scalar cbw as well as SIMD element sizes.
• https://stackoverflow.com/questions/55430725/whats-the-size-of-a-qword-on-a-64-bit-machine (the terminology depends on the ISA.)
• https://stackoverflow.com/questions/70911872/what-are-the-names-and-meanings-of-the-intrinsic-vector-element-types-like-epi6 focuses on intrinsic names, not asm mnemonics.
• https://stackoverflow.com/questions/44989391/meaning-of-suffix-x-in-intrinsics-like-mm256-set1-epi64x - more intrinsics stuff.