Advanced Micro Devices Inc (AMD)

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jhalada, But the extra registers of Hammer are not available for programs running in 32 bit mode, only 64 bit mode

That was my point. If the app is executed under 32-bit Windows, but really needs to perform some heavy calculations, it can turn off interrupts, switch to the 64-bit mode, calculate something using all new registers for, say, 1 ms, then switch back into 32-bit mode and enable interrupts. If switch between modes is too expensive, makes no sense, obviously. But technically possible.