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Re:AMD entered the CPU market with reverse-engineered Intel ... by fweimer on Wednesday December 24, 2025 @02:15PM (#46378319)
There's a Linux patch that exposes it via prctl: https://lore.kernel.org/all/20240410211652.16640-1-zayd_qums...

There's also the CFINV instruction (architectural, part of FEAT_FLAGM), which helps with emulating the x86-64 CMP instruction.

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