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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/97953] [8/9/10 Regression] ICE (segfault)
 during GIMPLE pass: loopdone compiling
 libgcc/config/libbid/bid128_fma.c:190:1
Date: Thu, 26 Nov 2020 15:20:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97953

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |11.0
           Priority|P3                          |P2
   Target Milestone|---                         |8.5
           Keywords|                            |wrong-code
            Summary|ICE (segfault) during       |[8/9/10 Regression] ICE
                   |GIMPLE pass: loopdone       |(segfault) during GIMPLE
                   |compiling                   |pass: loopdone compiling
                   |libgcc/config/libbid/bid128 |libgcc/config/libbid/bid128
                   |_fma.c:190:1                |_fma.c:190:1

--- Comment #21 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk, still broken on branches.  Note the hoisting re-ordering ma=
de
us no longer discover the full redundancy in PRE itself (as written in the
originating PR we would need to iterate and PRE insertion discovering full
redundancies is a bit of a corner case as well).=