On Tue, Nov 20, 2012 at 09:23:30AM +0200, Stefan Kristiansson wrote: > On Tue, Nov 20, 2012 at 08:08:01AM +0100, Jonas Bonn wrote: > > > Why did we choose r3 for the struct return location? > > > > It was not so much "us" choosing it. > gcc has done it all along, creating a "defacto" standard for it, > now we are just documenting it. > That said, I don't see using r3 as a bad choice, do you? >
After actually checking what had changed I understand your question, that text was supposed to be _added_ to what already was in the section "Functions Returning Structures or Unions", not replace it. The new text clarifies structures returned by _value_ Julius, the section should be like this in it's whole: 16.2.5 Functions Returning Structures or Unions A function that returns a structure or union places the address of the structure or union in the general-purpose RV register. A function that returns a structure by value expects the location where that structure is to be placed to be supplied in function parameter word 0 (R3). Stefan _______________________________________________ OpenRISC mailing list [email protected] http://lists.openrisc.net/listinfo/openrisc
