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Re: Empty loop elimination in 4.0 ?
On Jan 10, 2005, at 9:25 AM, Robert Dewar wrote:
Andrew Pinski wrote:
Or even in C now a days with all the optimizations we could do like
converting some loops to memset which still keeps the loop because it
ideal to have later passes delete the loop.
A loop converted to memset is not an empty loop! Can you give
some other example to show what you mean. to me if a loop ends
up empty, it is always a case to warn the programmer about.
f[i] = 0;
will be converted to:
memset (f, 0, i * sizeof(*f));
So we end up with an empty loop which then is removed by a later pass.
This is normal thing to do is have later passes remove junk. The
pass which does this transformation has no business in acting as