https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108292
--- Comment #9 from Roger Sayle <roger at nextmovesoftware dot com> ---
Another way to avoid the SCALAR_FLOAT_MODE_P problem is:
/* Add a REG_EQUAL note to allow condition to be shared. */
rtx note = gen_rtx_fmt_ee (orig_code, mode, op0, op1);
/* TMP is (orig_code op0 op1) ? 0 : -1, or swapped. */
note = orig_swapped ? gen_rtx_NEG (mode, node)
: gen_rtx_PLUS (mode, note, constm1_rtx);
set_unique_reg_note (get_last_insn (), REG_EQUAL, note);
i.e. don't attempt to modify the initial comparison; instead tweak the note.
