[Bug tree-optimization/117892] [15 Regression] ICE on valid code at -O1 and above on x86_64-linux-gnu: in single_succ_edge, at basic-block.h:332 since r15-5336-gcee7d080d5c2a5

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117892

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Jambor <jamb...@gcc.gnu.org>:

https://gcc.gnu.org/g:3d07e7bf13d4aec794dd25b5090c139b4d78283d

commit r15-7269-g3d07e7bf13d4aec794dd25b5090c139b4d78283d
Author: Martin Jambor <mjam...@suse.cz>
Date:   Wed Jan 29 10:51:08 2025 +0100

    tree-ssa-dce: Avoid creating invalid BBs with no outgoing edge (PR117892)

    Zhendong Su and Michal Jireš found out that our gimple DSE pass can,
    under fairly specific conditions, remove a noreturn call which then
    leaves behind a "normal" BB with no successor edges which following
    passes do not expect.  This patch simply tells the pass to leave such
    calls alone even when they otherwise appear to be dead.

    Interestingly, our CFG verifier does not report this.  I'll put on my
    todo list to add a test for it in the next stage 1.

    gcc/ChangeLog:

    2025-01-28  Martin Jambor  <mjam...@suse.cz>

            PR tree-optimization/117892
            * tree-ssa-dse.cc (dse_optimize_call): Leave control-altering
            noreturn calls alone.

    gcc/testsuite/ChangeLog:

    2025-01-27  Martin Jambor  <mjam...@suse.cz>

            PR tree-optimization/117892
            * gcc.dg/tree-ssa/pr117892.c: New test.
            * gcc.dg/tree-ssa/pr118517.c: Likewise.

    co-authored-by: Michal Jireš <mji...@suse.cz>