Re[2]: GCC won`t emit my instriction

["Alex Hill via gcc-help" <gcc-help@xxxxxxxxxxx>]

>Пятница,  7 июня 2019, 21:34 +05:00 от Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx>:
>
>Hi Alex,
>
>On Fri, Jun 07, 2019 at 07:42:26AM +0300, Alex Hill via gcc-help wrote:
>> I wrote a pattern in machine description file *.md to avoid branches:
>>     (define_insn "smin<GPR:mode>3"
>>       [
>>         (set 
>>           (match_operand:GPR 0 "register_operand" "=r")
>>             (if_then_else:GPR
>>           (lt:GPR 
>>             (match_operand:GPR 1 "register_operand" " r")
>>             (match_operand:GPR 2 "register_operand" " r"))
>>         (match_dup 1)
>>         (match_dup 2)))
>>       ]
>>       ""
>>       "min\t%0,%1,%2"
>>       [(set_attr "type" "move")
>>        (set_attr "mode" "<MODE>")]) 
>
>You could just do
>
>(define_insn "smin<mode>3"
>  [(set (match_operand:GPR 0 "register_operand" "=r")
>        (smin:GPR (match_operand:GPR 1 "register_operand" "r")
>                  (match_operand:GPR 2 "register_operand" "r")))]
>  ""
>  "min\t%0,%1,%2"
>  [(set_attr "type" "move")
>   (set_attr "mode" "<MODE>")])
>
>Does that work better?
>
>
>Segher
Of course i tried this before, but its not work.

I found some decision, i used flags -fexceptions -fnon-call-exceptions and it emits max insn, now i try to understand why this happens.
Here is the max it emits:
(define_insn "smax<GPR:mode>3"
    [(set (match_operand:GPR 0 "register_operand" "=r")
        (smax:GPR (match_operand:GPR 1 "register_operand" " r")
        (match_operand:GPR 2 "register_operand" " r")))]
""
"max\t%0,%1,%2"
[(set_attr "type" "move")
(set_attr "mode" "<MODE>")])

Kind regards Alex Hill.