[Bug bootstrap/97809] New: [11 Regression] AArch64 bootstrap broken, ICE when building mpf after g:86cca5cc14602814b98e55aae313fbe237af1b04

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97809

            Bug ID: 97809
           Summary: [11 Regression] AArch64 bootstrap broken, ICE when
                    building mpf after
                    g:86cca5cc14602814b98e55aae313fbe237af1b04
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tnfchris at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

The assert introduced here seems to get hit during stage 3 when building mpfr.

    during GIMPLE pass: pre
    ../../.././mpfr/src/sub1sp.c: In function 'mpfr_sub1sp':
    ../../.././mpfr/src/sub1sp.c:135:1: internal compiler error: in clean, at
tree-ssa-pre.c:2053
      135 | mpfr_sub1sp (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t
rnd_mode)
          | ^~~~~~~~~~~