[Bug target/83370] [AARCH64]Tailcall register may be corrupted by epilogue code

[renlin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83370

--- Comment #4 from Renlin Li <renlin at gcc dot gnu.org> ---
Author: renlin
Date: Thu Feb  1 21:09:06 2018
New Revision: 257314

URL: https://gcc.gnu.org/viewcvs?rev=257314&root=gcc&view=rev
Log:
[PR83370][AARCH64]Use tighter register constraint for sibcall patterns.

gcc/

        backport from mainline
        2018-02-01  Renlin Li  <renlin...@arm.com>

        PR target/83370
        * config/aarch64/aarch64.c (aarch64_class_max_nregs): Handle
        TAILCALL_ADDR_REGS.
        (aarch64_register_move_cost): Likewise.
        * config/aarch64/aarch64.h (reg_class): Rename CALLER_SAVE_REGS to
        TAILCALL_ADDR_REGS.
        (REG_CLASS_NAMES): Likewise.
        (REG_CLASS_CONTENTS): Rename CALLER_SAVE_REGS to
        TAILCALL_ADDR_REGS. Remove IP registers.
        * config/aarch64/aarch64.md (Ucs): Update register constraint.

gcc/testsuite/

        backport from mainline
        2018-02-01  Richard Sandiford  <richard.sandif...@linaro.org>

        PR target/83370
        * gcc.target/aarch64/pr83370.c: New.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.target/aarch64/pr83370.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/aarch64/aarch64.c
    branches/gcc-7-branch/gcc/config/aarch64/aarch64.h
    branches/gcc-7-branch/gcc/config/aarch64/constraints.md
    branches/gcc-7-branch/gcc/testsuite/ChangeLog