[Bug middle-end/95528] [10/11 Regression] internal compiler error: in emit_move_insn, at expr.c:3814

[slyfox at inbox dot ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95528

--- Comment #5 from Sergei Trofimovich <slyfox at inbox dot ru> ---
My bisect ended up at:
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=78307657cf9675bc4aa2e77561c823834714b4c8

$ git bisect bad
78307657cf9675bc4aa2e77561c823834714b4c8 is the first bad commit
commit 78307657cf9675bc4aa2e77561c823834714b4c8
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Nov 28 12:22:04 2019 +0000

    re PR tree-optimization/92645 (Hand written vector code is 450 times slower
when compiled with GCC compared to Clang)

    2019-11-28  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/92645
            * tree-ssa-forwprop.c (get_bit_field_ref_def): Also handle
            conversions inside a mode class.  Remove restriction on
            preserving the element size.
            (simplify_vector_constructor): Deal with the above and for
            identity permutes also try using VEC_UNPACK_[FLOAT_]LO_EXPR
            and VEC_PACK_TRUNC_EXPR.

            * gcc.target/i386/pr92645-4.c: New testcase.

    From-SVN: r278806

 gcc/ChangeLog                             | 10 ++++
 gcc/testsuite/ChangeLog                   |  5 ++
 gcc/testsuite/gcc.target/i386/pr92645-4.c | 56 ++++++++++++++++++
 gcc/tree-ssa-forwprop.c                   | 96 ++++++++++++++++++++++++++-----
 4 files changed, 154 insertions(+), 13 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr92645-4.c