From: shreyas76@gmail.com   
      
   Hi all   
      I wish to explore the scenarios when the type of an induction   
   variable used say to index A[i[ in a loop can be demoted to a short.   
   The motivation being it would aid in an efficient code using 16 bit   
   multiplies instead of needing 32 bit multiplies for the target.   
      
      
   So far I can see the following cases   
   1. Size of A is less than 2^32 and assuming the source does not do out   
   of array access. Does c99 provide such guarrantees ?   
      
   2. the maximum value of i is less that 2^16/ sizeof(A[i])   
   Size of A[i] is size of element.   
      
   Is my reasoning valid ? And are there other scenarios ?   
      
   Also can some one point to me any such existing work ?   
      
   thanks   
   shrey   
      
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