It was my first job out of University to design this instruction set which may explain some of the quirkiness...
Initially the instructions did all set the status flags but it caused a tight feedback loop in the processor. The choice was between a higher clock frequency for all instructions or better 64-bit arithmetic.
None of the initial video applications needed 64-bit support so it lost out, although I did get to put in the divide instruction just so my Doom port could run faster :)
Initially the instructions did all set the status flags but it caused a tight feedback loop in the processor. The choice was between a higher clock frequency for all instructions or better 64-bit arithmetic.
None of the initial video applications needed 64-bit support so it lost out, although I did get to put in the divide instruction just so my Doom port could run faster :)