RE: [avr-gcc-list] wrong code from avr-gcc 4.1.2?

[Weddington, Eric]

Hi Dr. John,

Are you using a particular WinAVR version? i.e. a patched avr-gcc 4.1.2?
Or is this stock FSF 4.1.2?

Can you post the compiler output?

Sorry, but most of the developers are dealing with HEAD/4.4 or maybe
4.3.0. I understand that you're using 4.1.2 for TinyOS.

Eric

> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of John Regehr
> Sent: Sunday, June 01, 2008 9:14 PM
> To: address@hidden
> Subject: [avr-gcc-list] wrong code from avr-gcc 4.1.2?
> 
> In the code below, avr-gcc 4.1.2 wants to return 1 from func_1() when 
> compiling at -Os.  Specifically I'm compiling like this:
> 
>    avr-gcc -fwrapv -Os -mmcu=atmega128 foo.c
> 
> I believe the correct answer is 0 (this is what avr-gcc-4.2.2 
> returns at 
> all optimization levels).  I don't think the -fwrapv is relevant here 
> but include it to be on the safe side.
> 
> John Regehr
> 
> 
> 
> static inline unsigned long int
> div_rhs(const long int rhs)
> {
>      if (rhs == 0) return 1;
>      return rhs;
> }
> 
> unsigned long g_66;
> long g_73;
> 
> int func_1 (void)
> {
>    unsigned long l_86 = -1L;
>    unsigned long l_93 = -9L;
>    if ((l_86 >= g_73) < (1 / div_rhs (l_93)))
>      return 1;
>    else
>      return 0;
> }
> 
> 
> 
> 
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