[Bug target/93047] frename-registers does not work well with __builtin_return

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93047

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jiu Fu Guo
<guoji...@gcc.gnu.org>:

https://gcc.gnu.org/g:0ce89ea10d93a583854f02bc115e05cfd9d818e4

commit r9-8282-g0ce89ea10d93a583854f02bc115e05cfd9d818e4
Author: Jiufu Guo <guoji...@linux.ibm.com>
Date:   Mon Feb 17 10:48:39 2020 +0800

    rs6000: mark clobber for registers changed by untpyed_call

    As PR93047 said, __builtin_apply/__builtin_return does not work well with
    -frename-registers.  This is caused by return register(e.g. r3) is used to
    rename another register, before return register is stored to stack.
    This patch fix this issue by emitting clobber for those egisters which
    maybe changed by untyped call.

    gcc/
    2020-02-26  Jiufu Guo  <guoji...@linux.ibm.com>

        PR target/93047
        * config/rs6000/rs6000.md (untyped_call): Add emit_clobber.

    gcc/testsuite
    2020-02-26  Jiufu Guo  <guoji...@linux.ibm.com>

        PR target/93047
        * gcc.dg/torture/stackalign/builtin-return-2.c: New test case.