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this for example: for (j = 0; j < N; ++j) { // trivial unswitch if (C) P[i+j] = 0; } turning it into the obvious code without bothering to duplicate an empty loop. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26220 91177308-0d34-0410-b5e6-96231b3b80d8