This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: gcc port to StarCore


At 8:38 AM +0200 5/2/02, David Livshin wrote:
>
>  > Can you post the define_expand and/or define_insn for these?
>>
>
>You are right - the pattern is:
>
>
>( define_expand "cmpsi"
>   [ ( set ( cc0 )
>       ( compare ( match_operand:SI 0 "drREG_operand" "d,z" )
>                 ( match_operand:SI 1 "drREG_operand" "d,z" )
>       )
>     )
>   ]
>   ""
>   "
>   {
>    StarCore_DefineExpand_cmp( operands, FALSE, FALSE );
>    DONE;
>   }"
>)


Well, this would prevent the initial generation of compares with 
literals as operands - but for most ports, the compiler will 
initially "load" literals into pseudo-registers ANYWAY and let the 
various optimization passes figure out which things are better off as 
immediate values.

I should have just asked for your DEFINE_INSN that matches the 
compare patterns.   Also, you
use a function to actually generate the RTL - so I can't see what 
sort of RTL you're really producing
or consuming!

How about posting:

	1/ The rtl dump for your simple example - the first one, and 
possibly the
	     combine dump.

	2/ the DEFINE_INSNs for compares



-- 
		    Quality Software Management
		http://home.earthlink.net/~qsmgmt
		          apl@alum.mit.edu
		          (978)287-0435 Voice
		          (978)808-6836 Cell

	Software Process Improvement / Management Consulting
	     Language Design / Compiler Implementation


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]