delayed branches and zero overhead loops

[Dave Brolley]

Joern Rennecke wrote:

>On Tue, Feb 13, 2007 at 04:11:52PM -0500, Frank Ch. Eigler wrote:
>  
>
>>The decoder generator is fully automatic.  If you represent decodable
>>bits without cheating, it will do a reasonable job.
>>    
>>
>
>I which that were the case.  Try to generate the decoder for the attached
>file; it warns about one alledged Decoder ambiguity for j_L_r_r [$RC-noilink]
>versus j_L_r_r [$RC-ilink] .  The values for $RC-ilink and $RC-noilink are
>disjoint.  I've also tried to use a decode-split on this problem, but to
>no avail.
>  
>
The problem is that RC-ilink and RC-noilink are operands. They do not 
participate in insn decoding. If there are no other differences in the 
fixed fields of the insns (it's hard to tell because of the complexity 
of your pmacros), then there will be an ambiguity. If you add enough 
"-v"s to CGENFLAGS when you run your make, you will get a dump of the 
pmacro-expanded input.

Dave