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2016 Feb 12
3
Experimental 6502 backend; memory operand folding problem
...y operands. In the test file above, in @testSum, switch %a, %b to %b, %a. llc will assert in Register Spilling: "Remaining use wasn't a snippet copy". Debug output shows STRabs being generated, followed by an attempted fold of a stack-load into ADDabs. I must be on the wrong track in M6502InstrInfo::foldMemoryOperandImpl. If someone could please explain this error, it would really help. Thanks! - Nolan