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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/101507] New: ice for gcc.dg/Wstringop-overflow-69.c with
 -march=iwmmxt
Date: Mon, 19 Jul 2021 09:24:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101507

            Bug ID: 101507
           Summary: ice for gcc.dg/Wstringop-overflow-69.c with
                    -march=3Diwmmxt
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For gcc testsuite file ./gcc.dg/Wstringop-overflow-69.c, it compiles happily
with march=3Darmv8.6-a and many other settings, but isn't happy with
-march=3Diwmmxt

$ /home/dcb/raspberrypi/results/bin/arm-linux-gnueabihf-gcc -c -w -march=3D=
iwmmxt
./gcc.dg/Wstringop-overflow-69.c
during RTL pass: reload
./gcc.dg/Wstringop-overflow-69.c: In function =E2=80=98warn_vec_func=E2=80=
=99:
./gcc.dg/Wstringop-overflow-69.c:84:1: internal compiler error: maximum num=
ber
of generated reload insns per insn achieved (90)
   84 | }
      | ^
0xd7d3aa lra_constraints(bool)
        /home/dcb/gcc/trunk.git/gcc/lra-constraints.c:5091

This looks to me like some internal buffer overflow.=