Undefined argument processing order in C, C (gcc)

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//gcc 7.4.0
#include<stdio.h>
int main() {
int i = 1; 
printf("%d %d %d\n",pr(++i),pr(i++),pr(i)); // 3 1 1
i=1;
printf("%d %d %d",++i,i++,i); // 3 1 3
return 0; 
}
int pr(int v){
  printf ("arg: %d\n",v);
  return v;
}

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Compilation time: 0.12 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,46 sec