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2020 Jun 30
2
How to prevent llvm's default optimization
Hi, James, Thanks for your reply. I do not think it is always true, that "mul then add" is faster than "add then mul". For example, A small immediate can be directly encoded in the instruction, but it becomes a larger one after a multiplication, which has to be loaded from the constant pool (extra memory access). So I wonder, is it possile to prevent it, via changes