[Bug target/91527] New: [10 Regression] ICE in update_equiv_regs, at ira.c:3473 since r274694

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91527

            Bug ID: 91527
           Summary: [10 Regression] ICE in update_equiv_regs, at
                    ira.c:3473 since r274694
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

Since the revision, I see:

$ g++ /home/marxin/Programming/gcc/gcc/testsuite/g++.dg/tree-ssa/pr21463.C -O3
-mabi=ms -msse4
during RTL pass: ira
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/tree-ssa/pr21463.C: In member
function ‘T foo_t<T>::bar_ref(T, T) [with T = int]’:
/home/marxin/Programming/gcc/gcc/testsuite/g++.dg/tree-ssa/pr21463.C:13:2:
internal compiler error: in update_equiv_regs, at ira.c:3473
   13 |  }
      |  ^
0x73fb29 update_equiv_regs
        /home/marxin/Programming/gcc/gcc/ira.c:3473
0xe03c62 ira
        /home/marxin/Programming/gcc/gcc/ira.c:5308
0xe03c62 execute
        /home/marxin/Programming/gcc/gcc/ira.c:5663