[Bug middle-end/24644] [4.1 Regression] gcc-4.1 compiled ppc64 kernels do not boot

[ian at airs dot com]

------- Comment #14 from ian at airs dot com  2005-11-04 16:09 -------
gcc is free to copy non-volatile variables.  It does this in many places and
for many reasons, particularly in the new SSA optimizers in 4.0 and later.  I
don't know the details of where it decided to copy the register in this test
case, but presumably it seemed profitable to some heuristic.  I expect that it
could happen if the usage is in a loop, or used on both branches of an if
conditional, etc.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24644