[Bug middle-end/87528] Popcount changes caused 531.deepsjeng_r run-time regression on Skylake

[kugan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87528

--- Comment #7 from kugan at gcc dot gnu.org ---
Author: kugan
Date: Mon Nov 12 23:43:56 2018
New Revision: 266039

URL: https://gcc.gnu.org/viewcvs?rev=266039&root=gcc&view=rev
Log:
gcc/ChangeLog:

2018-11-13  Kugan Vivekanandarajah  <kug...@linaro.org>

        PR middle-end/86677
        PR middle-end/87528
        * tree-scalar-evolution.c (expression_expensive_p): Make BUILTIN
POPCOUNT
        as expensive when backend does not define it.

gcc/testsuite/ChangeLog:

2018-11-13  Kugan Vivekanandarajah  <kug...@linaro.org>

        PR middle-end/86677
        PR middle-end/87528
        * g++.dg/tree-ssa/pr86544.C: Run only for target supporting popcount
        pattern.
        * gcc.dg/tree-ssa/popcount.c: Likewise.
        * gcc.dg/tree-ssa/popcount2.c: Likewise.
        * gcc.dg/tree-ssa/popcount3.c: Likewise.
        * gcc.target/aarch64/popcount4.c: New test.
        * lib/target-supports.exp (check_effective_target_popcountl): New.


Added:
    trunk/gcc/testsuite/gcc.target/aarch64/popcount4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr86544.C
    trunk/gcc/testsuite/gcc.dg/tree-ssa/popcount.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/popcount2.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/popcount3.c
    trunk/gcc/testsuite/lib/target-supports.exp
    trunk/gcc/tree-scalar-evolution.c