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RE: [avr-gcc-list] Can someone benchmark this option please

From: Weddington, Eric
Subject: RE: [avr-gcc-list] Can someone benchmark this option please
Date: Wed, 23 Jul 2008 11:17:30 -0600


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Andy H
> Sent: Tuesday, July 22, 2008 6:40 PM
> Subject: [avr-gcc-list] Can someone benchmark this option please
> Hi,
> I have noted problem where gcc is optimizing if-then-else 
> constructs - 
> with disastrous results. For example:
> if (a  >= 0)
>   return 8;
> else
>  return 0;
> (This is now reported as bug.)
> Can folks try the following gcc option
>  -fno-if-conversion
> on their own code at -Os optimization, and see if this produce 
> better/worse or same code? This will help figure if the whole pass 
> should be skipped - or whether it still contains useful optimizations.

Hi Andy,

I tried it on the BC100 Kit code for gcc, which uses these options:


When I added -fno-if-conversion, there was no change in code size: 5588 bytes.

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