[Bug target/36223] IV-opt is not optimal for mips

Tue Aug 25 00:37:00 GMT 2009

------- Comment #7 from ebotcazou at gcc dot gnu dot org  2009-08-25 00:37 -------
I tweaked IVOPTS a few months ago to help in similar cases on PowerPC:

2009-05-29  Eric Botcazou  <ebotcazou@adacore.com>

        * tree-ssa-loop-ivopts.c (strip_offset_1) <MULT_EXPR>: New case.
        (force_expr_to_var_cost) <NEGATE_EXPR>: Likewise.
        (ptr_difference_cost): Use affine combinations to compute it.
        (difference_cost): Likewise.
        (get_computation_cost_at): Compute more accurate cost for addresses
        if the ratio is a multiplier allowed in addresses.
        For non-addresses, consider that an additional offset or symbol is
        added only once.

Maybe this helped for MIPS in this case.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36223