From: already5chosen@yahoo.com   
      
   On Tue, 25 Nov 2025 14:12:07 +0200   
   Michael S  wrote:   
   >   
   > Doing the same with shifts is almost as convenient as with _BitInt and   
   > it works great on all popular compilers, but according to wording of C   
   > Standard it is Undefined Behavior.   
   >   
   > int sign_extend12(unsigned x)   
   > {   
   >   return (int32_t)((uint32_t)x << 20) >> 20;   
   > }   
   >   
      
   Before someone corrects me, I'd correct myself: the code above does not   
   contain Undefined Behavior. It's merely Implementation Defined Behavior.   
      
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