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From: Alexei Pytel <pytel@us.ibm.com> > > 2) the tagged pointer protection is not hardware, but is done in > > software, so need not contribute to make memory more expensive. > > With all respect, the tagged pointer protection *is* hardware. > It could in theory be done by software, but it would incur unacceptable > overhead. > Well, the RISC code to check if a pointer is valid is: LQ R6, addr ; load pointer into R6, R7. set bit in exception reg if no tag TXER nn ; trap if no tag to me that is software. The trap can be disabled by replacing the TXER instruction by a NOOP. The overhead is the TXER instruction and is not unacceptable.
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