[Bug tree-optimization/126538] Compile time hog with gimple-range-phi and bitint

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126538

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andrew Macleod <[email protected]>:

https://gcc.gnu.org/g:21c8ddd2cd2f3bf64225e4523e20e795083676fb

commit r17-3296-g21c8ddd2cd2f3bf64225e4523e20e795083676fb
Author: Andrew MacLeod <[email protected]>
Date:   Wed Aug 12 14:34:00 2026 -0400

    Limit the number of iterations in phi analyzer.

    The phi analyzer attempts to provide initial values for cyclic PHIs by
    simulating the modifer by the number of bits of precision.  _BitInt
    objects can be very large, and it is pointless to try to simulate them
    that many ttimes.

            PR tree-optimization/126538
            gcc/
            * gimple-range-phi.cc (phi_group::calculate_using_modifier): Limit
the
            iteration upper bound to MAX_FIXED_MODE_SIZE.

            gcc/testsuite/
            * gcc.dg/pr126538.c: New.