[Bug rtl-optimization/78617] LRA clobbers live register during rematerialization

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78617

--- Comment #6 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Author: thopre01
Date: Tue Jan 17 10:11:20 2017
New Revision: 244526

URL: https://gcc.gnu.org/viewcvs?rev=244526&root=gcc&view=rev
Log:
2017-01-17 Thomas Preud'homme <thomas.preudhomme@arm.com>

    Backport from mainline
    2016-12-07 Thomas Preud'homme <thomas.preudhomme@arm.com>

    gcc/
    PR rtl-optimization/78617
    * lra-remat.c (do_remat): Initialize live_hard_regs from live in
    registers, also setting hard registers mapped to pseudo registers.

    gcc/testsuite/
    PR rtl-optimization/78617
    * gcc.c-torture/execute/pr78617.c: New test.

Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.c-torture/execute/pr78617.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/lra-remat.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog