[Bug rtl-optimization/93565] [9/10 regression] Combine duplicates instructions

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93565

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wilco@gcc.gnu.org>:

https://gcc.gnu.org/g:5bfc8303ffe2d86e938d45f13cd99a39469dac4f

commit r10-6598-g5bfc8303ffe2d86e938d45f13cd99a39469dac4f
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Wed Feb 12 18:23:21 2020 +0000

    [AArch64] Set ctz rtx_cost (PR93565)

    Combine sometimes behaves oddly and duplicates ctz to remove an unnecessary
    sign extension.  Avoid this by setting the cost for ctz to be higher than
    that of a simple ALU instruction.  Deepsjeng performance improves by ~0.6%.

    gcc/
        PR rtl-optimization/93565
        * config/aarch64/aarch64.c (aarch64_rtx_costs): Add CTZ costs.

    testsuite/
        PR rtl-optimization/93565
        * gcc.target/aarch64/pr93565.c: New test.