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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99927] [11 Regression] Maybe wrong code since
 r11-39-gf9e1ea10e657af9f
Date: Tue, 06 Apr 2021 14:02:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99927

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Before combine it looks fine:
(insn 23 22 105 6 (parallel [
            (set (reg:SI 108)
                (udiv:SI (reg:SI 104)
                    (reg/v:SI 102 [ var_6 ])))
            (set (reg:SI 107)
                (umod:SI (reg:SI 104)
                    (reg/v:SI 102 [ var_6 ])))
            (clobber (reg:CC 17 flags))
        ]) "pr99927.c":13:24 449 {*udivmodsi4}
     (expr_list:REG_DEAD (reg:SI 104)
        (expr_list:REG_UNUSED (reg:SI 108)
            (expr_list:REG_UNUSED (reg:CC 17 flags)
                (nil)))))
(insn 105 23 106 6 (set (reg:QI 135)
        (const_int 1 [0x1])) "pr99927.c":13:24 77 {*movqi_internal}
     (nil))
(insn 106 105 107 6 (parallel [
            (set (reg:QI 134)
                (and:QI (subreg:QI (reg:SI 107) 0)
                    (const_int 1 [0x1])))
            (clobber (reg:CC 17 flags))
        ]) "pr99927.c":13:24 491 {*andqi_1}
     (expr_list:REG_UNUSED (reg:CC 17 flags)
        (nil)))
(insn 107 106 108 6 (set (reg:CCZ 17 flags)
        (compare:CCZ (reg:SI 107)
            (const_int 0 [0]))) "pr99927.c":13:24 7 {*cmpsi_ccno_1}
     (expr_list:REG_DEAD (reg:SI 107)
        (nil)))
(insn 108 107 111 6 (set (reg:QI 96 [ var_lsm_flag.12 ])
        (if_then_else:QI (eq (reg:CCZ 17 flags)
                (const_int 0 [0]))
            (reg:QI 134)
            (reg:QI 135))) "pr99927.c":13:24 1104 {*movqicc_noc}
     (expr_list:REG_DEAD (reg:QI 134)
        (nil)))
but in combine dump there is:
(insn 23 22 105 6 (parallel [
            (set (reg:SI 108)
                (udiv:SI (reg:SI 104)
                    (reg/v:SI 102 [ var_6 ])))
            (set (reg:SI 107)
                (umod:SI (reg:SI 104)
                    (reg/v:SI 102 [ var_6 ])))
            (clobber (reg:CC 17 flags))
        ]) "pr99927.c":13:24 449 {*udivmodsi4}
     (expr_list:REG_DEAD (reg:SI 104)
        (expr_list:REG_UNUSED (reg:SI 108)
            (expr_list:REG_UNUSED (reg:CC 17 flags)
                (nil)))))
(note 105 23 106 6 NOTE_INSN_DELETED)
(note 106 105 107 6 NOTE_INSN_DELETED)
(insn 107 106 108 6 (set (reg:QI 135)
        (const_int 1 [0x1])) "pr99927.c":13:24 77 {*movqi_internal}
     (nil))
(note 108 107 111 6 NOTE_INSN_DELETED)
(insn 111 108 85 6 (set (reg:QI 96 [ var_lsm_flag.12 ])
        (if_then_else:QI (eq (reg:CCZ 17 flags)
                (const_int 0 [0]))
            (subreg:QI (reg:SI 107) 0)
            (reg:QI 135))) "pr99927.c":13:24 1104 {*movqicc_noc}
     (expr_list:REG_DEAD (reg:SI 107)
        (expr_list:REG_DEAD (reg:QI 135)
            (nil))))=