[Bug target/125057] LoongArch LASX: GCC 16 ICE in RTL split2 with __lasx_cast_128(__lsx_vld(...)) followed by __lasx_vext2xv_*

Wed, 06 May 2026 03:23:19 -0700 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125057

--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by LuluCheng <[email protected]>:

https://gcc.gnu.org/g:1bb9817fa87644db91d713808a78d571086d0d78

commit r17-350-g1bb9817fa87644db91d713808a78d571086d0d78
Author: Lulu Cheng <[email protected]>
Date:   Thu Apr 30 15:56:30 2026 +0800

    LoongArch: Fix ICE caused by incomplete split conditions [PR125057].

    Since the split conditions in loongarch_split_vector_move are incomplete,
    the following RTL:

            (set (reg:V4DI 32 $f0) (subreg:V4DI (reg:V2DI 32 $f0) 0))

    is incorrectly split, leading to an ICE.

    This patch fixes the issue by completing the split conditions.

            PR target/125057

    gcc/ChangeLog:

            * config/loongarch/loongarch.cc
            (loongarch_split_vector_move): Complete the split condition.
            * config/loongarch/loongarch.h (LSX_REG_RTX_P): Delete.
            (LASX_REG_RTX_P): Delete.
            (GP_REG_RTX_P): Define macro.

    gcc/testsuite/ChangeLog:

            * gcc.target/loongarch/vector/lasx/pr125057.c: New test.
            * gcc.target/loongarch/vector/lsx/lsx-mov-2.c: New test.

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