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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97141] [10/11 Regression] aarch64, SVE: ICE in
 decompose, at rtl.h (during expand) since r10-4676-g9c437a108a
Date: Wed, 16 Dec 2020 14:10:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97141

--- Comment #2 from Alex Coplan <acoplan at gcc dot gnu.org> ---
Adding -fno-tree-forwprop gives us an ICE in LRA instead:

$ aarch64-elf-gcc -c pr97141.c -O3 -march=3Darmv8.2-a+sve -fno-tree-forwprop

during RTL pass: reload
pr97141.c: In function 'g':
pr97141.c:8:1: internal compiler error: maximum number of generated reload
insns per insn achieved (90)
    8 | }
      | ^
0xc08d23 lra_constraints(bool)
        /home/alecop01/toolchain/src/gcc/gcc/lra-constraints.c:5061
0xbeff49 lra(_IO_FILE*)
        /home/alecop01/toolchain/src/gcc/gcc/lra.c:2329
0xba2af8 do_reload
        /home/alecop01/toolchain/src/gcc/gcc/ira.c:5802
0xba2af8 execute
        /home/alecop01/toolchain/src/gcc/gcc/ira.c:5988
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Originally noticed this LRA ICE with the related testcase:

int a;
void b() {
  a =3D 0;
  for (; a !=3D -24; a =3D (short)a - 3) {
    short *c;
    *c |=3D 0 < b;
  }
}=