[Bug target/124165] [16 Regression] Many std::map -> long compilation time at -O0 (late_pro_and_epilogue pass involved) since r16-7563

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124165

--- Comment #14 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>:

https://gcc.gnu.org/g:a7cce1afee8ba28c524a4a43f0081e36e5501cf2

commit r16-7880-ga7cce1afee8ba28c524a4a43f0081e36e5501cf2
Author: H.J. Lu <hjl.to...@gmail.com>
Date:   Sun Feb 22 10:32:30 2026 +0800

    x86: Call ix86_access_stack_p only with symbolic constant load

    ix86_access_stack_p can be quite expensive.  Cache the result and call it
    only if there are symbolic constant loads.  This reduces the compile time
    of PR target/124165 test from 202 seconds to 55 seconds.

    gcc/

            PR target/124165
            * config/i386/i386-protos.h (symbolic_reference_mentioned_p):
            Change the argument type from rtx to const_rtx.
            * config/i386/i386.cc (symbolic_reference_mentioned_p): Likewise.
            (ix86_access_stack_p): Add 2 auto_bitmap[] arguments.  Cache
            the register BB domination result.
            (ix86_symbolic_const_load_p_1): New.
            (ix86_symbolic_const_load_p): Likewise.
            (ix86_find_max_used_stack_alignment): If there is no symbolic
            constant load into the register, don't call ix86_access_stack_p.

    Signed-off-by: H.J. Lu <hjl.to...@gmail.com>