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RE: [avr-gcc-list] Transfer bit conserved by gcc?

From: Weddington, Eric
Subject: RE: [avr-gcc-list] Transfer bit conserved by gcc?
Date: Fri, 19 Sep 2008 08:25:23 -0600


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Ruud Vlaming
> Sent: Friday, September 19, 2008 5:15 AM
> To: address@hidden
> Subject: [avr-gcc-list] Transfer bit conserved by gcc?
> It is hard to find an awnser to the following question by google, 
> so lets post it here.
> Is it true that avr-gcc never produces code that makes explicit
> use of the T-bit? 


In GCC 4.3.2, in the machine description for the avr (gcc/config/avr/avr.md), 
there is define_insn "abssf2" that will use the T bit. It generates a CLT and 
BLD instructions. However, I have no idea how often the define_insn "abssf2" 
will trigger. But yes, there is a possibility.

And of course gas is aware of the SET and CLT instructions.

Eric Weddington

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