[Bug target/114528] (0xFFFFFFFF0001FFFFULL - 0x00123000) constant forming could be done in 2 instructions

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114528

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wi...@gcc.gnu.org>:

https://gcc.gnu.org/g:a1bcce749cf2347820956d9f6bdaa03951421b15

commit r16-6775-ga1bcce749cf2347820956d9f6bdaa03951421b15
Author: Wilco Dijkstra <wilco.dijks...@arm.com>
Date:   Mon Jan 12 14:19:46 2026 +0000

    AArch64: Improve immediate generation [PR 114528]

    Improve immediate generation to support 2-instruction MOV+ADD/SUB
    of 12-bit shifted immediate. Eg.

    long f1 (void)
    {
      return 0x123400567000;
    }

    now generates:

    mov     x0, 20014547599360
    add     x0, x0, 5664768
    ret

    gcc:
            PR target/114528
            * config/aarch64/aarch64.cc (aarch64_check_mov_add_imm12):
            New function to check and emit MOV+ADD/SUB immediates.
            (aarch64_internal_mov_immediate): Add support for MOV+ADD/SUB
            immediates.

    gcc/testsuite:
            PR target/114528
            * gcc.target/aarch64/pr114528.c: New test.