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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/108086] [11/12 Regression] internal compiler
 error: in set_accesses, at rtl-ssa/internals.inl:449
Date: Mon, 03 Apr 2023 08:57:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108086

--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Sandiford
<rsandifo@gcc.gnu.org>:

https://gcc.gnu.org/g:160c5f354a6dc8a660ff8ad8574279b0d3fb412d

commit r12-9377-g160c5f354a6dc8a660ff8ad8574279b0d3fb412d
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Mon Apr 3 09:57:05 2023 +0100

    rtl-ssa: Extend m_num_defs to a full unsigned int [PR108086]

    insn_info tried to save space by storing the number of
    definitions in a 16-bit bitfield.  The justification was:

      // ...  FIRST_PSEUDO_REGISTER + 1
      // is the maximum number of accesses to hard registers and memory, and
      // MAX_RECOG_OPERANDS is the maximum number of pseudos that can be
      // defined by an instruction, so the number of definitions should fit
      // easily in 16 bits.

    But while that reasoning holds (I think) for real instructions,
    it doesn't hold for artificial instructions.  I don't think there's
    any sensible higher limit we can use, so this patch goes for a full
    unsigned int.

    gcc/
            PR rtl-optimization/108086
            * rtl-ssa/insns.h (insn_info): Make m_num_defs a full unsigned =
int.
            Adjust size-related commentary accordingly.

    (cherry picked from commit cd41085a37b8288dbdfe0f81027ce04b978578f1)=