RE: [avr-gcc-list] Re: Wierd Calls.

[Dave Hansen]

From: address@hidden

[...] 

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.

 

into

 

// This takes 8.9uS at 4 MHz

Bin = ( A >> 5)

 

Just guessing, but it may be trying to preserve truncation toward zero (required by C99) if the _expression_ is signed.

 

Regards,

 

   -=Dave

 

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