https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69008
Michael Collison <michael.collison at linaro dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|target |rtl-optimization --- Comment #3 from Michael Collison <michael.collison at linaro dot org> --- Changed to component rtl optimization. Occurs on other targets as well. On MIPS, for example, generates two redundant store to memory at -O2: (insn 5 23 6 (set (mem/c:SI (reg/f:SI 29 $sp) [1 t+0 S4 A32]) (reg:SI 4 $4)) bugzilla_69008.c:7 310 {*movsi_internal} (nil)) (insn 6 5 18 (set (mem/c:SI (plus:SI (reg/f:SI 29 $sp) (const_int 4 [0x4])) [1 t+4 S4 A32]) (reg:SI 5 $5)) bugzilla_69008.c:7 310 {*movsi_internal} (nil)) (insn 18 6 30 (use (reg/i:SI 2 $2)) bugzilla_69008.c:9 -1 (nil)) (note 30 18 27 NOTE_INSN_EPILOGUE_BEG) (insn 27 30 32 (clobber (reg:SI 28 $28)) bugzilla_69008.c:9 -1 (nil)) (insn 32 27 29 (sequence [ (jump_insn 28 27 17 (simple_return) bugzilla_69008.c:9 629 {*simple_return} (nil) -> simple_return) (insn 17 28 29 (set (reg/i:SI 2 $2) (plus:SI (reg:SI 4 $4) (reg:SI 5 $5))) 13 {*addsi3} (nil)) ]) bugzilla_69008.c:9 -1 (nil))