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My favorite is features from IA-64 that had to be ported to AMD64 after the fact. For example, IA-64 had two stacks. Before SYSCALL was fixed for AMD64, it was

by yuhong 8y ago

My favorite is features from IA-64 that had to be ported to AMD64 after the fact. For example, IA-64 had two stacks. Before SYSCALL was fixed for AMD64, it was so poorly designed that the only OS I know supporting it was XP pre-SP2.

duskwuff 8y ago
> features from IA-64 that had to be ported to AMD64 after the fact I'm not sure what you mean by this. IA-64 was Itanium. While it did have two stacks, that feature never existed on either vendor's implementation of x86-64.
- yuhong 8y ago
  Intel CET I believe.