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Intel® 64 and IA-32 Architectures
Software Developer’s Manual
Volume 2A:
Instruction Set Reference, A-M

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[MUL—Unsigned Multiply]
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Flags Affected
The OF and CF flags are set to 0 if the upper half of the result is 0; otherwise, they
are set to 1. The SF, ZF, AF, and PF flags are undefined.