Quoting "Paulo J. Matos" <pa...@matos-sorge.com>:
This is a very strange insn indeed: (set (ge (reg:QI 0 AH [orig:26 w ] [26]) (const_int 0 [0])) (plus:QI (plus:QI (ltu:QI (reg:CC 13 CC) (const_int 0 [0])) (lt (reg:QI 0 AH [orig:30 a ] [30]) (const_int 0 [0]))) (const_int 0 [0])))
Smells like rtl sharing.