[Bug rtl-optimization/116179] [15 regression] -fcompare-debug -gno-statement-frontiers failure with -O3 when building mesa-24.1.4 since r15-1735-ge62ea4fb8ffcab (late combine)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116179

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[15 regression]             |[15 regression]
                   |-fcompare-debug             |-fcompare-debug
                   |-gno-statement-frontiers    |-gno-statement-frontiers
                   |failure with -O3 when       |failure with -O3 when
                   |building mesa-24.1.4        |building mesa-24.1.4 since
                   |                            |r15-1735-ge62ea4fb8ffcab
                   |                            |(late combine)
           Keywords|needs-bisection             |
                 CC|                            |rsandifo at gcc dot gnu.org

--- Comment #9 from Sam James <sjames at gcc dot gnu.org> ---
Thanks for the hint Jeff. Indeed, it goes away with
-fno-late-combine-instructions, and it bisects to r15-1735-ge62ea4fb8ffcab. I
imagine if I did -flate-combine-instructions, it'd bisect to the original
commit adding late combine.