bdcf04246c
This change fixes issue found by Markus: https://reviews.llvm.org/rG11338e998df1 Before this patch following code was transformed to memmove: for (int i = 15; i >= 1; i--) { p[i] = p[i-1]; sum += p[i-1]; } However load from p[i-1] is used not only by store to p[i] but also by sum computation. Therefore we cannot emit memmove in loop header. Differential Revision: https://reviews.llvm.org/D107964