[Bug target/110268] [14 Regression] arm MVE intrinsics support broken with LTO

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110268

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Christophe Lyon <clyon@gcc.gnu.org>:

https://gcc.gnu.org/g:eca10aaa3954af3dab56eccc208c90273c2b1732

commit r14-2418-geca10aaa3954af3dab56eccc208c90273c2b1732
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date:   Mon Jun 26 14:39:47 2023 +0000

    arm: Fix MVE intrinsics support with LTO (PR target/110268)

    After the recent MVE intrinsics re-implementation, LTO stopped working
    because the intrinsics would no longer be defined.

    The main part of the patch is simple and similar to what we do for
    AArch64:
    - call handle_arm_mve_h() from arm_init_mve_builtins to declare the
      intrinsics when the compiler is in LTO mode
    - actually implement arm_builtin_decl for MVE.

    It was just a bit tricky to handle __ARM_MVE_PRESERVE_USER_NAMESPACE:
    its value in the user code cannot be guessed at LTO time, so we always
    have to assume that it was not defined.  The led to a few fixes in the
    way we register MVE builtins as placeholders or not.  Without this
    patch, we would just omit some versions of the inttrinsics when
    __ARM_MVE_PRESERVE_USER_NAMESPACE is true. In fact, like for the C/C++
    placeholders, we need to always keep entries for all of them to ensure
    that we have a consistent numbering scheme.

    2023-06-26  Christophe Lyon   <christophe.lyon@linaro.org>

            PR target/110268
            gcc/
            * config/arm/arm-builtins.cc (arm_init_mve_builtins): Handle LTO.
            (arm_builtin_decl): Hahndle MVE builtins.
            * config/arm/arm-mve-builtins.cc (builtin_decl): New function.
            (add_unique_function): Fix handling of
            __ARM_MVE_PRESERVE_USER_NAMESPACE.
            (add_overloaded_function): Likewise.
            * config/arm/arm-protos.h (builtin_decl): New declaration.

            gcc/testsuite/
            * gcc.target/arm/pr110268-1.c: New test.
            * gcc.target/arm/pr110268-2.c: New test.