On 31.01.2015 22:30, Alan Cox wrote: >> AFAIR some users want to keep the second register set reserved for >> interrupt handlers or syscalls. However once we have the more flexible >> handling of iy we will be able to generate code like >> >> add iy, de >> adc hl, bc >> >> for 32-bit additions. > > That will certainly help in a few cases. I can understand why some users > want to keep the alternate registers free, but for those who can use it > the lack of them really hurts the 32bit code gen. > > Alan
Sure being able to use the alternative register set would be an improvement (even more for for the Rabbits). But there are some issues: 1) Some users don't want to use the second register set, so not all would benefit 2) More flexible handling of registers will help both your use case and many others 3) Using the second register set makes interrupot handlers more expensive, since 3a) You can't use exx any more to save the registers, making saving of the first register set more expensive 3b) You also have to save the second register set That doesn't mean I don't want it implemented, it just means that other things seem more important to me at the moment. Philipp
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