[Bug rtl-optimization/30957] Misscompare with variable expansion optimization

[eres at il dot ibm dot com]

------- Comment #6 from eres at il dot ibm dot com  2007-02-26 15:01 -------
It seems that initializing the expansion with -zero (instead of +zero)
will solve this problem.

According IEEE standard if we have -

x += something; initializing x with -0 will cause x to get the sign of
something.

-0 + (-0) = -0
-0 + (+0) = +0


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30957