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Subject: [Bug target/106122] [12/13 Regression] ICE in fixup_args_size_notes, 
 at expr.cc:4493 since r12-6106-gef26c151c14a8717
Date: Fri, 01 Jul 2022 08:20:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106122

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:

https://gcc.gnu.org/g:17419b61edd350147b0cc10c3da0b8461e51a42c

commit r13-1380-g17419b61edd350147b0cc10c3da0b8461e51a42c
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Fri Jul 1 09:18:07 2022 +0100

    PR target/106122: Don't update %esp via the stack with -Oz on x86.

    When optimizing for size with -Oz, setting a register can be minimized =
by
    pushing an immediate value to the stack and popping it to the destinati=
on.
    Alas the one general register that shouldn't be updated via the stack is
    the stack pointer itself, where "pop %esp" can't be represented in GCC's
    RTL ("use of a register mentioned in pre_inc, pre_dec, post_inc or
    post_dec is not permitted within the same instruction").  This patch
    fixes PR target/106122 by explicitly checking for SP_REG in the
    problematic peephole2.

    2022-07-01  Roger Sayle  <roger@nextmovesoftware.com>

    gcc/ChangeLog
            PR target/106122
            * config/i386/i386.md (peephole2): Avoid generating pop %esp
            when optimizing for size.

    gcc/testsuite/ChangeLog
            PR target/106122
            * gcc.target/i386/pr106122.c: New test case.=