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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/99724] New: [11 Regression] CE in in extract_insn, at
 recog.c:2770
Date: Tue, 23 Mar 2021 10:25:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99724

            Bug ID: 99724
           Summary: [11 Regression] CE in in extract_insn, at recog.c:2770
           Product: gcc
           Version: 11.0
            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
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: arm-linux-gnueabi

The following causes an ICE:

$ arm-linux-gnueabi-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-minus-1.c -mcpu=3Diw=
mmxt2
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-minus-1.c: In functi=
on
=E2=80=98g=E2=80=99:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-minus-1.c:13:1: erro=
r:
unrecognizable insn:
   13 | }
      | ^
(insn 10 9 11 2 (set (reg:V2SI 114 [ _2 ])
        (not:V2SI (reg:V2SI 113 [ _1 ])))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-minus-1.c":10:11 -1
     (nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/fold-minus-1.c:13:1: inte=
rnal
compiler error: in extract_insn, at recog.c:2770=