https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85116
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- So what is missing is for us to see that for the following __first_21 is __first_20 + 8B and so we can replace either with the other. IVOPTs figures this out but nothing before. <bb 4> # __first_20 = PHI <&testArray._M_elems(2), __first_21(7)> # __first_21 = PHI <&MEM[(void *)&testArray + 8B](2), __first_7(7)> ... _8 = MEM[(const double *)__first_20 + 8B]; <bb 3> [local count: 955630224]: # __result_15 = PHI <__first_21(5), __result_22(8)> __first_7 = __first_21 + 8; if (__first_7 != &MEM[(void *)&testArray + 8000B]) goto <bb 7>; [89.00%] else goto <bb 6>; [11.00%] <bb 7> [local count: 850510900]:
