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Подставляет правильно, но документации это не соответствует.

"Intel C/C Compiler Intrinsics Equivalents Section"
"The intrinsics allow you to specify the underlying implementation (instruction selection) of an algorithm yet leave instruction scheduling and register allocation to the compiler."

Да, то есть вроде как тасовать инструкции может, но не должен использовать другую инструкцию..

но там же есть отсыл к документации компилятора:
"For a more detailed description of each intrinsic and additional information related to its usage, refer to Intel C/C++ compiler documentation"
и
"It is strongly recommended that the reader reference the compiler documentation
for the complete list of supported intrinsics"

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