From: bc@nospicedham.freeuk.com   
      
   On 22/07/2017 22:53, James Harris wrote:   
   > On 22/07/2017 21:11, Bartc wrote:   
      
   >> I think that demonstrates the trouble I have with the official   
   >> register names!   
   >   
   > Lots of history led to where we are now!   
   >   
   > I prefer plain numbering such as the IBM S360+ and others which simply   
   > call registers r0 to r15.   
      
   Exactly. But R8 to R15 are already taken, and I wanted to swap around   
   the special registers, so that RSP becomes R15 for example. And move the   
   parameter-passing registers to the top.   
      
   I've used AC0 to AC15 before, but that's rather old-fashioned. So I   
   decided on D0 to D15, with a register size also encoded within the   
   register name, 'D' meaning 64 bits. (I think D0 to D15 were used as   
   32-bit data registers on the 68K.)   
      
   The new XMM registers are least are numbered properly, even if the 'XMM'   
   prefix is a bit naff.   
      
   --   
   bartc   
      
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