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Subject: [Bug middle-end/100775] ICE: in df_exit_block_bitmap_verify, at
 df-scan.c:4164 with -mthumb -fzero-call-used-regs=used
Date: Wed, 16 Mar 2022 20:21:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100775

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Qing Zhao <qinzhao@gcc.gnu.o=
rg>:

https://gcc.gnu.org/g:9b1faeb5bfef258780e313aa8302a43f98f3b442

commit r11-9663-g9b1faeb5bfef258780e313aa8302a43f98f3b442
Author: Qing Zhao <qing.zhao@oracle.com>
Date:   Wed Mar 16 20:18:54 2022 +0000

    middle-end/100775 - updating the reg use in exit block for
-fzero-call-used-regs

    GCC11 backport.

    In the pass_zero_call_used_regs, when updating dataflow info after addi=
ng
    the register zeroing sequence in the epilogue of the function, we should
    call "df_update_exit_block_uses" to update the register use information=
 in
    the exit block to include all the registers that have been zeroed.

    gcc/ChangeLog:

            PR middle-end/100775
            * function.c (gen_call_used_regs_seq): Call
            df_update_exit_block_uses when updating df.

    gcc/testsuite/ChangeLog:

            PR middle-end/100775
            * gcc.target/arm/pr100775.c: New test.=