Re: [avr-libc-dev] Considerable Compiler improvement needs testing

[Andy Hutchinson]

I am unaware of any negative feedback on the change.

I ran MODES_TIEABLE_P together with Roger's latest "rtx_cost" patch. 
Together I was seeing reduction from 0x3746 to 0x3462 on my testcode. Of 
equal importance is that the code is becoming much cleaner and makes it 
much easier to spot and implement other areas of improvement. I dont 
like to count the number of times I have tried an "obvious" fix and the 
whole code when pear shaped!

I have posted bug report against documentation for MODES_TIEABLE_P.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19815

Although this is DOCUMENTATION BUG  I think we should be able to use as 
a marker.(Advise - If somebody knows that there should also be a target 
bug report then I can add).

Can some kind sole submit a patch for MODES_TIEABLE_P

we have

#define MODES_TIEABLE_P(MODE1, MODE2) 0

we need

#define MODES_TIEABLE_P(MODE1, MODE2) 1

Pretty good code metrics on this one!