https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99394
--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> --- Here we fail with: tsvc.c:1526:27: note: vect_is_simple_use: operand x_30 = PHI <_2(8), x_18(3)>, type of def: unknown tsvc.c:1526:27: missed: Unsupported pattern. tsvc.c:1527:26: missed: not vectorized: unsupported use in stmt. tsvc.c:1526:27: missed: unexpected pattern. { int i; int nl; real_t x; static const char __func__[5] = "s254"; struct timeval * _1; float _2; float _3; float _4; struct timeval * _5; real_t _17; unsigned int ivtmp_27; unsigned int ivtmp_28; unsigned int ivtmp_29; unsigned int ivtmp_35; <bb 2> [local count: 108459]: initialise_arrays (&__func__); _1 = &func_args_13(D)->t1; gettimeofday (_1, 0B); <bb 3> [local count: 10737416]: # nl_31 = PHI <nl_20(7), 0(2)> # ivtmp_28 = PHI <ivtmp_27(7), 400000(2)> x_18 = b[31999]; <bb 4> [local count: 1063004409]: # x_30 = PHI <_2(8), x_18(3)> # i_32 = PHI <i_22(8), 0(3)> # ivtmp_35 = PHI <ivtmp_29(8), 32000(3)> _2 = b[i_32]; _3 = _2 + x_30; _4 = _3 * 5.0e-1; a[i_32] = _4; i_22 = i_32 + 1; ivtmp_29 = ivtmp_35 - 1; if (ivtmp_29 != 0) goto <bb 8>; [98.99%] else goto <bb 5>; [1.01%] <bb 8> [local count: 1052266996]: goto <bb 4>; [100.00%] ....