Whoever defines the Intel mm* intrinsics needs to sit down more with a) the people who spec the instructions b) the people who implement the compilers. Many of the intrinsics (especially newer ones) are a really bad match for the underlying instrs and effetively sabotage them.
Unpopular opinion: compilers should deprecate them all & document how to write equivalent high level code they can effectively vectorize.
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As it stands now, proper use of inline asm constraints is more expressive & less incorrect/UB than the intrinsics mess.
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