[Bug target/96558] New: [11 Regression] ICE in extract_constrain_insn, at recog.c:2195 (error: insn does not satisfy its constraints)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96558

            Bug ID: 96558
           Summary: [11 Regression] ICE in extract_constrain_insn, at
                    recog.c:2195 (error: insn does not satisfy its
                    constraints)
           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: asolokha at gmx dot com
  Target Milestone: ---
            Target: x86_64-unknown-linux-gnu-gcc

gcc-11.0.0-alpha20200809 snapshot (g:71197a5d13d0b540a9b5efe7ae2512d76386e9d1)
ICEs when compiling the following testcase w/ -O2 -fno-expensive-optimizations
-fno-gcse:

int ky;
long int h1;
__int128 f1;

int
sd (void);

int __attribute__ ((simd))
i8 (void)
{
  __int128 vh;

  if (sd () == 0)
    h1 = 0;

  do
    {
      long int lf = h1;
      long int w1 = f1;

      if (w1 == 0)
        lf = 0;
      else
        lf = lf && w1;

      ky += lf;

      vh = lf | f1;
      f1 = 1;
    }
  while (vh < (f1 ^ 2));

  return 0;
}

% x86_64-unknown-linux-gnu-gcc-11.0.0 -O2 -fno-expensive-optimizations
-fno-gcse -c yocbyzz3.c
yocbyzz3.c: In function 'i8.simdclone.6':
yocbyzz3.c:34:1: error: insn does not satisfy its constraints:
   34 | }
      | ^
(insn 157 14 158 3 (parallel [
            (set (reg:DI 20 xmm0 [orig:121 _53 ] [121])
                (const_int 0 [0]))
            (clobber (reg:CC 17 flags))
        ]) "yocbyzz3.c":13:6 68 {*movdi_xor}
     (expr_list:REG_UNUSED (reg:CC 17 flags)
        (nil)))
during RTL pass: cprop_hardreg
yocbyzz3.c:34:1: internal compiler error: in extract_constrain_insn, at
recog.c:2195
0x68e957 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200809/work/gcc-11-20200809/gcc/rtl-error.c:108
0x68e97d _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200809/work/gcc-11-20200809/gcc/rtl-error.c:118
0x68cfb5 extract_constrain_insn(rtx_insn*)
       
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200809/work/gcc-11-20200809/gcc/recog.c:2195
0xcf76fb copyprop_hardreg_forward_1
       
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200809/work/gcc-11-20200809/gcc/regcprop.c:802
0xcf864e execute
       
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200809/work/gcc-11-20200809/gcc/regcprop.c:1367