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Instcombine (setcc (truncate X), C1). This occurs THOUSANDS of times in many benchmarks. Particularlly common seem to be things like (seteq (cast bool X to int), int 0) This turns it into (seteq bool %X, false), which then becomes (not %X). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16567 91177308-0d34-0410-b5e6-96231b3b80d8