> -----Original Message----- > From: > avr-gcc-list-bounces+eweddington=cso.atmel....@nongnu.org > [mailto:avr-gcc-list-bounces+eweddington=cso.atmel....@nongnu. > org] On Behalf Of Dave Hylands > Sent: Thursday, March 12, 2009 8:25 AM > To: David VanHorn > Cc: AVR-GCC > Subject: Re: [avr-gcc-list] Re: Wierd Calls. > > > I'm still puzzled as to why the compiler didn't change: > > > > // This takes 53uS at 4 MHz > > Bin = ( A / Data_Divisor ) // Data_Divisor is a constant, 32. > > If I declare > > const uint32_t Data_Divisor = 32; > > then it calls the helper function, but if I declare > > const int Data_Divisor = 32; > > then it appears to use the shift. >
??? That's weird. An unsigned divisor needs a helper function, but using a signed divisor will cause it to generate a shift. _______________________________________________ AVR-GCC-list mailing list AVR-GCC-list@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
