[Bug rtl-optimization/117934] New: [15 Regression] 100% memory-usage increase for PR26854 testcase at -O2 after ext-dce r15-1901-g98914f9eba5f19

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117934

            Bug ID: 117934
           Summary: [15 Regression] 100% memory-usage increase for PR26854
                    testcase at -O2 after ext-dce r15-1901-g98914f9eba5f19
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

At -O2 r15-1901-g98914f9eba5f19 (ext-dce introduction) causes a
memory-usage regression for all.i from PR26854
(http://www.math.purdue.edu/~lucier/gcc/test-files/bugzilla/1/all.i.gz)
changing from

260.87user 13.71system 4:34.76elapsed 99%CPU (0avgtext+0avgdata
11851888maxresident)k

to

286.10user 17.44system 5:03.75elapsed 99%CPU (0avgtext+0avgdata
20850180maxresident)k

so we now take 20GB peak memory use instead of 12GB.