https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110324

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(gdb) p ((enum rtx_code) (x)->code)
$3 = DEFINE_COND_EXEC
(gdb) p (int)((enum rtx_code) (x)->code)
$4 = 172

and hence:

(gdb) p rtx_format[172]
$6 = 0x4bcda0 "EssV"


where we take the index 2 => 's'.

The EssV matches the rtl.def entry:

   DEF_RTL_EXPR(DEFINE_COND_EXEC, "define_cond_exec", "EssV", RTX_EXTRA)

Actually, grepping for 'T' I only find:

 "define_insn", "sEsTV"
 "define_peephole", "EsTV"
 "define_insn_and_split", "sEsTsESV"
 "define_insn_and_rewrite", "sEsTsSV"

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