[Bug tree-optimization/17955] New: Perform associative optimization when it is safe

[fjahanian at apple dot com]

PR/17892  was filed because gcc-4.0 performs an unsafe optimization of (X*C)*C into X*(C*C).
Fix to this PR prevents certain safe transformation; such as X*2.0*2.0->X*4.0 from taking place.
This PR is to track this enhancement.

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           Summary: Perform associative optimization when it is safe
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: roger at eyesopen dot com
        ReportedBy: fjahanian at apple dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: apple-ppc-darwin
  GCC host triplet: apple-ppc-darwin
GCC target triplet: apple-ppc-darwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17955