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...e see the two IR outputs I have saved below: https://github.com/dibyendumajumdar/ravi/tree/master/ravi-tests/comp_issue The original.ll is the code I am generating. The aftercompiling.ll is the output from LLVM with opt level 0. The issue is that LLVM is deciding to remove the blocks with labels updatei and updatei.64 (lines 433 and 454 in original.ll) for some reason that I cannot fathom. This is then causing the program to misbehave. I will check if the same issue occurs in LLVM 3.6. I would appreciate any help on understanding what might be causing this issue. Many thanks Regards Dibyendu