https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101325
Christophe Lyon <clyon at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2021-07-07 Ever confirmed|0 |1 --- Comment #4 from Christophe Lyon <clyon at gcc dot gnu.org> --- Before r12-671, in combine we have: (insn 7 4 8 2 (set (reg:HI 117) (unspec:HI [ (reg:V16QI 119) (reg:V16QI 120) ] VCMPEQQ_S)) {mve_vcmpeqq_v16qi} (expr_list:REG_DEAD (reg:V16QI 120) (expr_list:REG_DEAD (reg:V16QI 119) (nil)))) (note 8 7 14 2 NOTE_INSN_DELETED) (insn 14 8 15 2 (set (reg/i:SI 0 r0) (zero_extend:SI (reg:HI 117))) "pr101325.c":7:1 1019 {*thumb2_zero_extendhisi2_v6} (expr_list:REG_DEAD (reg:HI 117) (nil))) After the patch: (insn 7 4 8 2 (set (reg:HI 117) (eq:HI (reg:V16QI 119) (reg:V16QI 120))) {mve_vcmpeqq_v16qi} (expr_list:REG_DEAD (reg:V16QI 120) (expr_list:REG_DEAD (reg:V16QI 119) (nil)))) (note 8 7 14 2 NOTE_INSN_DELETED) (insn 14 8 15 2 (set (reg/i:SI 0 r0) (and:SI (subreg:SI (reg:HI 117) 0) (const_int 1 [0x1]))) "pr101325.c":7:1 90 {*arm_andsi3_insn} (expr_list:REG_DEAD (reg:HI 117) (nil)))