[tree-ssa] doloop problems

[Andrew Pinski]

On the SSA branch for loops for some reason do not produce doloops 
optimizations.
This patch makes the for loops to cause it to happen.

Now gimplify for a for loop is from:
for (INIT;COND;INCREMENT)
	BODY
to:
INIT
if (COND)
	{
		while (1)
		{
			BODY
			INCREMENT
			if (!COND)
				goto OUTOFLOOP;
		}
OUTOFLOOP:
	}



Yes this makes increases the initial number of rtl (and trees) 
generated by 3 (4 from the mainline)
but by the time it gets written out as asm, there will be less rtl than 
what is generated
currently on the branch.

Testcase:
void temp(int limit, float *x)
{
         int i;
         for(i=0;i<limit;i++)
                 x[i] = 0;
}


ChangeLog:
2003-06-16  Andrew Pinski <pinskia@physics.uc.edu>

	* c-simplify.c (gimplify_for_stmt): Add if before loop and
	move the condition to the end of the loop.


Patch:
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Thanks,
Andrew Pinski