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loop optimizations, mark 11


Things of note in this edition:

  * Incorprorated Bernd Schmidt's suggestions for treatment of benefit
    in and around general_induction_var.

  * Fixed a long-standing bug in express_from that caused the ia32
    code-gen lossage.

  * Fixed a bit in find_mem_givs that was causing -frerun-loop-opt to
    generate worse code on Alpha.  I am now interested to see code
    samples that generate different code when loop is rerun.


r~

d-loop-11.gz


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