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After running through bugpoint, I get this reduced function You can reproduce the problem with: opt bugpoint-reduced-function.bc -break-crit-edges -adce -verify Bugpoint is currently trying to narrow down which block breaks this, but is so far failing. It seems to be running out of memory rather than failing on a particular block. This is on freebsd 5.4, X86, llvm is compiled with gcc 3.4.2