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[Bug target/36223] IV-opt is not optimal for mips
- From: "ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 25 Aug 2009 00:37:26 -0000
- Subject: [Bug target/36223] IV-opt is not optimal for mips
- References: <bug-36223-14095@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- 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.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36223