https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99407
--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Here we get: s243.c:27:18: missed: not vectorized, possible dependence between data-refs a[i_29] and a[_9] s243.c:26:27: missed: bad data dependence. s243.c:26:27: note: ***** Analysis failed with vector mode V8QI <bb 6> [local count: 1052266997]: <bb 3> [local count: 1063004410]: # i_29 = PHI <_9(6), 0(4)> # ivtmp_43 = PHI <ivtmp_42(6), 31999(4)> _1 = b[i_29]; _2 = c[i_29]; _3 = d[i_29]; _4 = _2 * _3; _5 = _1 + _4; a[i_29] = _5; _6 = e[i_29]; _7 = _3 * _6; _8 = _5 + _7; b[i_29] = _8; _9 = i_29 + 1; _10 = a[_9]; _11 = _3 * _10; _12 = _8 + _11; a[i_29] = _12; ivtmp_42 = ivtmp_43 - 1; if (ivtmp_42 != 0) goto <bb 6>; [98.99%] else goto <bb 5>; [1.01%]