http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49007
--- Comment #16 from John David Anglin <danglin at gcc dot gnu.org> 2011-05-23 16:40:57 UTC --- The use is deleted because insn 434 has been retargeted from code_label 322 to code_label 465: (insn 434 58 366 ../../gcc/gcc/basic-block.h:194 (sequence [ (jump_insn 59 58 92 ../../gcc/gcc/basic-block.h:194 (set (pc) (if_then_else (gtu (reg:SI 28 %r28 [orig:132 <variable>.base.num ] [132]) (const_int 2 [0x2])) (label_ref:SI 465) (pc))) 25 {*pa.md:1770} (expr_list:REG_DEAD (reg:SI 28 %r28 [orig:132 <variable>.base.num ] [132]) (expr_list:REG_BR_PROB (const_int 9700 [0x25e4]) (nil)))) (insn/s 92 59 366 (set (reg/v:SI 4 %r4 [orig:111 i ] [111]) (const_int 2 [0x2])) 37 {*pa.md:2542} (expr_list:REG_EQUAL (const_int 2 [0x2]) (nil))) ]) -1 (nil)) The code_label 322 then has zero uses.