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To: rakdver@atrey.karlin.mff.cuni.cz, gcc@gcc.gnu.org
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Subject: loop unroll question
From: Revital Eres <ERES@il.ibm.com>
Message-ID: <OF103AF0B8.FE8C5968-ONC2256E69.00516126-C2256E69.0051778D@il.ibm.com>
Date: Thu, 01 Apr 2004 14:53:00 -0000
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Hello,

For mainline on power-pc 4 with the option -O3 -funroll-loops, 
the following loop is not unrolled, but in GCC 3.4 it is. 
Also for mainline the bct is not inserted, but again in GCC 3.4 
it is.

void
example_new(int a[],int b[],int c[], int j) 
{
    int i;

    for(i=0 ; i<=j ; i++) 
       {
          c[i]=a[i]+b[i];
       }
    return;
}

If the condition is changed to < (instead of <=) the unrolling is 
done as expected and bct is inserted.

Thanks,
Revital