[Bug target/92744] New: [10 Regression] error: insn does not satisfy its constraints since r278439

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92744

            Bug ID: 92744
           Summary: [10 Regression] error: insn does not satisfy its
                    constraints since r278439
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

I see following ICE:

$ cat return.ii
class A {
public:
  typedef float __dec32 __attribute__((mode(SD)));
  __dec32 __val;
};
bool operator!=(A p1, A p2) { return p1.__val != p2.__val; }
void fn1();
void fn2(A p1, A p2) {
  if (p1 != p2)
    fn1();
}

$ g++ return.ii -fno-tree-ccp -Os -c
return.ii: In function ‘void fn2(A, A)’:
return.ii:11:1: error: insn does not satisfy its constraints:
   11 | }
      | ^
(insn 43 4 9 2 (parallel [
            (set (reg:SI 21 xmm1 [ p2 ])
                (reg:SI 20 xmm0 [orig:84 p1 ] [84]))
            (set (reg:SI 20 xmm0 [orig:84 p1 ] [84])
                (reg:SI 21 xmm1 [ p2 ]))
        ]) "return.ii":9:3 78 {*swapsi}
     (nil))
during RTL pass: cprop_hardreg
return.ii:11:1: internal compiler error: in extract_constrain_insn, at
recog.c:2195
0x7e973a _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:108
0x7e9760 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/marxin/Programming/gcc/gcc/rtl-error.c:118
0x7e79e3 extract_constrain_insn(rtx_insn*)
        /home/marxin/Programming/gcc/gcc/recog.c:2195
0x109c6ef copyprop_hardreg_forward_1
        /home/marxin/Programming/gcc/gcc/regcprop.c:802
0x109d50e execute
        /home/marxin/Programming/gcc/gcc/regcprop.c:1367
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