3 ms·
Yes, AMD should have added it to x64. It isn't exactly new either. The Alpha's integer instructions had a bit in the instruction word that indicated if an overf
by solarexplorer 12y ago
Yes, AMD should have added it to x64. It isn't exactly new either. The Alpha's integer instructions had a bit in the instruction word that indicated if an overflow should cause a trap or not. IMHO that is the ideal solution.
- thesz 12y agoNo, it is not an ideal solution. It causes decrease in clock frequency for about 10% (or you have to make your design noticeably more complex). The trap in Alpha ISA was done for MIPS compatibility reasons (Alpha was more or less MIPS assembly compatible).