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3.0 loop unroll fixes


I know it is late for that, but I wonder if the fix for PR 3384 could
be applied to the mainline.  See also the thead at
http://gcc.gnu.org/ml/gcc-bugs/2001-07/msg00750.html.

I think this is a bad regression from 2.95.2 even if it only happens
with -funroll-loops.  Bootstrapped and passed the regressions on
powerpc-ibm-aix4.3.3 and on i686-pc-linux-gnu.

Zoli


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