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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/90275] [8/9 Regression] ICE: in insert_regs,
 at cse.c:1128 with -O2 -fno-dce -fno-tree-dce
Date: Thu, 02 Apr 2020 20:43:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90275

--- Comment #18 from David Binderman <dcb314 at hotmail dot com> ---
For this C code:

a() {
  short *b;
  short c;
  long long *d =3D a;
  for (;;) {
    long long *e =3D a;
    (*d *=3D *e - c) / *b ?: (*b =3D 0);
  }
}

on this week's raspberry pi C cross compiler, with flag -O2, does this:

$ /home/dcb/raspberrypi/results/bin/arm-linux-gnueabihf-gcc -c -w -O2
testFile.97.c
during RTL pass: cse_local
testFile.97.c: In function =E2=80=98a=E2=80=99:
testFile.97.c:9:1: internal compiler error: in insert_regs, at cse.c:1128
    9 | }
      | ^
0x7e5b19 insert_regs
        /home/dcb/gcc/trunk.git/gcc/cse.c:1128
0x17ab64b cse_insn
        /home/dcb/gcc/trunk.git/gcc/cse.c:5956
0x17ade1d cse_extended_basic_block
        /home/dcb/gcc/trunk.git/gcc/cse.c:6614
0x17ade1d cse_main
        /home/dcb/gcc/trunk.git/gcc/cse.c:6793

This code works on x86, so something arm specific is happening.=