From: bolek-compilers@curl.com   
      
   glen herrmannsfeldt wrote:   
   > As far as passing arguments in registers, there is at least one   
   > convention (possibly SPARC, but I am not sure now) where some are   
   > passed in registers, but stack space is still reserved for them.  The   
   > called routine can then store them into the stack.  As some number of   
   > words are kept in the registers, in some cases a double variable will   
   > be half in a register and half on the stack.  Storing to the stack is   
   > a convenient way to get the two back together again.   
      
   This is the case for 32-bit PowerPC.   
      
   Bolek   
      
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