More Quesa optimisation

[Roger H. <rog...@mi...>]

e3group_submit_render is used a great deal, recursing very deeply in  
Microspot's applications, so Shark shows it, and the routines it  
calls use a lot of CPU time. I have a couple of optimisations for it,  
but lets keep it simple and do one at a time for now. It calls  
OpaqueTQ3Object::GetClass, which (in the disassembled code)pushes a  
register, checks that its 'this' pointer is NULL and sets the return  
register to a field of 'this', or to NULL if 'this' was NULL, then  
pops the register back off and actually returns.

e3group_submit_render then ignores whether the return value was NULL  
and dereferences it.

An optimisation for this is to have an inline   
OpaqueTQ3Object::FastGetClass which just returns the field of the  
class. This avoids the register pop, the call, the test for NULL and  
may allow e3group_submit_render to make better use of its registers,  
which are somewhat more limited on Intel than they were on PowerPC.

I also changed e3view_submit_retained_render and E3Object_IsType to  
use the fast version as they too do not check for NULL and uses a lot  
of CPU time calling OpaqueTQ3Object::GetClass.

If nobody objects, the changes are:

In E3View.c in e3view_submit_retained_render

	E3Root* theClass = (E3Root*) theObject->FastGetClass () ;


In E3Main.c in E3Object_IsType

	return theObject->FastGetClass ()->IsType ( theType ) ;


In E3Grroup.c in e3group_submit_render

	E3GroupInfo* groupClass = (E3GroupInfo*) theObject->FastGetClass () ;


In E3Main.h in struct OpaqueTQ3Object just after the definition of  
GetClass


	E3ClassInfoPtr				FastGetClass ( void )  { return theClass ; }



Roger.