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int si1,;
int si2,;
int sresult;

sresult = si1 << si2;

unsigned int ui1,;
unsigned int ui2,;
unsigned int sresult;

if ((ui2 >= sizeof(int)*CHAR_BIT) 
  || (ui1 > (INT_MAX >> ui2)) ) 
{
  /* handle error condition */
}
else {
  sresult = ui1 << ui2;
}

unsigned int ui1,;
unsigned int ui2,;
unsigned int uresult;

uresult = ui1 << ui2;

unsigned int ui1,
unsigned int ui2,
unsigned int uresult;

/* modulo behavior is allowed on mod1 and mod2 by exception */
unsigned int mod1,
unsigned int mod2;  

/* ... */

if ( (ui2 >= sizeof(unsigned int)*CHAR_BIT) 
  || (ui1 > (UINT_MAX  >> ui2))) ) 
{
  /* handle error condition */
}
else {
  uresult = ui1 << ui2;
}

if (mod2 >= sizeof(unsigned int)*CHAR_BIT) {
  /* handle error condition */
}
else {
  /* modulo behavior is allowed by exception */
  uresult = mod1 << mod2; 
}