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Hi, I write a backend and come cross an abnormal problem. Here I give a example to describe it: /////////////////////////////////////////////////////////////////////////////////////////// // A simple C function int foo() { return 1234; } ///////////////////////////////////////////////////////////////////////////////////////// When compiling foo() into my target ISA, I would expect codes

Hi, > The headache is when I pass option -O0 to llc, the generated codes are > correct. However, if I omit -O0 and use default compiling options, the > instruction "movi r0, #1234" does not show. It's probably being eliminated as dead code. You want to make sure that during ISelLowering your RET instruction has %R0 as one of its operands (check in the -view-isel-dags