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If an instruction is marked as side-effect free then it's a candidate for CSE. Try marking the instruction with hasSideEffects. Evan On Dec 17, 2011, at 12:24 PM, Johannes Birgmeier wrote: > Hello, > > I'm writing for a backend and have a complicated instruction bundle (3 > instructions) that has to be executed like a single block (meaning: if > the first instruction

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Hello, I'm writing for a backend and have a complicated instruction bundle (3 instructions) that has to be executed like a single block (meaning: if the first instruction is executed, all three have to be executed to obtain the result, though not necessarily without other instructions in between). Unfortunately, MachineCSE gets in the way sometimes and rips it apart. Is there a way to