[Bug tree-optimization/115661] [15 Regression] wrong code at -O{2, 3} on x86_64-linux-gnu since r15-1599-g63512c72df09b4

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115661

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
This fixes it for me as a hack:
```
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -412,20 +412,10 @@ ix86_expand_move (machine_mode mode, rtx operands[])
        }
       else
        {
-#if TARGET_PECOFF
-         tmp = legitimize_pe_coff_symbol (op1, addend != NULL_RTX);
-         if (tmp)
-           {
-             op1 = tmp;
-             if (!addend)
-               break;
-           }
-         else
            {
              op1 = operands[1];
              break;
            }
-#endif
        }

       if (addend)
```

Before r15-1599-g63512c72df09b4, legitimize_pe_coff_symbol would return
NULL_RTX for non-PECOFF targets, so the else branch would get taken.