[llvm-dev] New to LLVM. Need help generating assembly (original) (raw)

Daniel Sanders via llvm-dev llvm-dev at lists.llvm.org
Thu Dec 6 09:31:25 PST 2018

On Dec 5, 2018, at 22:15, Tom Stellard via llvm-dev <llvm-dev at lists.llvm.org> wrote:

On 12/05/2018 07:22 PM, m m via llvm-dev wrote: Hi, I'm new to LLVM and need some help. I defined an instruction to increment the stack pointer by 'amount' (i.e. sp = sp + amount). During assembly generation, the string that gets emitted is "ADS $SP" rather than "ADS 10", for example, if I want to increment it by 10.

Can somebody show me what I'm doing wrong? Thanks. def ADS: FJ<0b100001,(outs),(ins i32imm:$amount),"ADS amount",[(setSP,(addSP,i32imm:amount",[(set SP, (add SP, i32imm:amount",[(setSP,(addSP,i32imm:amount))] > { bits<10> amount; let Inst{9-0} = amount; let isReMaterializable = 1; let mayLoad = 0; let mayStore = 0; let Defs = [SP]; let Uses = [SP]; } What does the MCInst dump of this instruction look like? Have you looked at YourTargetGenAsmWriter.inc to see which print methods are being called for this instruction? -Tom

It's also worth checking the output of the compiler with the -print-after-all option to see if your instruction is present in the last IR dump. It's possible that another instruction is being selected instead of this one.

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