[Bug target/99570] New: internal error in extract_constrain_insn

[Bug target/99570] New: internal error in extract_constrain_insn

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99570

            Bug ID: 99570
           Summary: internal error in extract_constrain_insn
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arnd at linaro dot org
  Target Milestone: ---

This happens in a couple of files when building the linux kernel with -Os,
reduced a test case to:

$ cat compaction.i
typedef struct {
  long a
} b;
enum c { d } e[];
af, ah;
f(b *g) { asm("" : "=m"(g->a)); }
struct h {
  _Bool ab
} static i(struct h *g, long j) {
  long k = 0, l = j;
  for (; j;) {
    enum c ad = m();
    n();
    f(&e[ad]);
    k += o();
    if (g && g->ab)
      ++j;
    p();
  }
  q(l, k);
}
r() {
  for (;;)
    i(af, ah);
}

$ x86_64-linux-gnu-gcc-11 -Os -c compaction.i
compaction.i: In function ‘r’:
compaction.i:25:1: error: unrecognizable insn:
   25 | }
      | ^
(insn 22 20 23 4 (parallel [
            (set (mem:DI (plus:DI (mult:DI (reg:DI 3 bx [orig:99 _9 ] [99])
                            (const_int 4 [0x4]))
                        (symbol_ref:DI ("e") [flags 0x2] <var_decl
0x7f5b20afcb40 e>)) [2 MEM[(struct b *)_11].a+0 S8 A64])
                (asm_operands:DI ("") ("=m") 0 []
                     []
                     [] compaction.i:6))
            (clobber (reg:CC 17 flags))
        ]) "compaction.i":6:11 -1
     (nil))
during RTL pass: reload
compaction.i:25:1: internal compiler error: in extract_constrain_insn, at
recog.c:2670
0xce2eb1 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../src/gcc/rtl-error.c:108
0xce3057 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../src/gcc/rtl-error.c:116
0x95f537 extract_constrain_insn(rtx_insn*)
        ../../src/gcc/recog.c:2670
0x95f537 extract_constrain_insn(rtx_insn*)
        ../../src/gcc/recog.c:2666
0x95f537 check_rtl
        ../../src/gcc/lra.c:2087
0x17962bc lra(_IO_FILE*)
        ../../src/gcc/lra.c:2505
0x1794579 do_reload
        ../../src/gcc/ira.c:5827
0x1794579 execute
        ../../src/gcc/ira.c:6013
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-11/README.Bugs> for instructions.

$ x86_64-linux-gnu-gcc-11 --version
x86_64-linux-gnu-gcc-11 (Ubuntu 11-20210306-1ubuntu1) 11.0.1 20210306
(experimental) [master revision
574e7601829:6b84c9062bc:84185598dc7470bad4e7f8c22b64e3c944efb670]

[Bug target/99570] internal error in extract_constrain_insn

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99570

--- Comment #1 from Arnd Bergmann <arnd at linaro dot org> ---
I suppose this is a duplicate of #99567 and #99574, these happen with different
compiler flags, but the backtrace is always the same.

[Bug target/99570] internal error in extract_constrain_insn

[arnd at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99570

Arnd Bergmann <arnd at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Arnd Bergmann <arnd at linaro dot org> ---
This was fixed at the same time as #99567, which has the same backtrace.

*** This bug has been marked as a duplicate of bug 99567 ***