Fix LLVM IR compatibility issue in aiecc.py by updating downgrade_ir_for_peano

[Fangtangtang]

When compiling with aiecc.py, I encountered errors such as:

error: expected ')' at end of argument list
declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
                                                          ^

This was caused by the presence of captures(none) in the IR.
To fix this, I updated compiler/aiecc/main.py so that downgrade_ir_for_peano now replaces captures(none):

def downgrade_ir_for_peano(llvmir):
    llvmir = llvmir.replace("getelementptr inbounds nuw", "getelementptr inbounds")
    llvmir = llvmir.replace("captures(none)", "nocapture")
    return llvmir

This resolves the compilation error and allows the IR to be correctly lowered.

Note: I noticed a similar issue was mentioned earlier in PR #2038

[andrej]

Thanks for your contribution. @fifield's earlier PR you mention seems to address chess specifically, and I haven't run across this issue with peano.

Before merging this in, I want to make sure this isn't already addressed by a newer peano version. Can you share your peano version and exact command you ran that caused you to run into this issue? After setting your environment, running $PEANO_INSTALL_DIR/bin/clang++ --version should give you the version.

[Fangtangtang]

Hi, I'm using clang version 19.0.0 (https://github.com/Xilinx/llvm-aie b2a279c1939604e2ee82a651683dd995decc25ee).

I ran into this error when running the following command:
aiecc.py --alloc-scheme=basic-sequential --aie-generate-xclbin --no-compile-host --xclbin-name=build/final.xclbin --no-xchesscc --no-xbridge --peano ${PEANO_INSTALL_DIR} --aie-generate-npu-insts --npu-insts-name=insts.txt top.mlir

I have attached a zipped copy of the working directory where I ran this command.
tmp.zip

[fifield]

I verified the problem exists for the version of llvm-aie suggested by quick_setup.sh. However, with the latest nightly wheel of llvm-aie there is no error. The version I tried is llvm_aie-20.0.0.2025092301+6bef69

[jgmelber]

Is this fix worth including for users who would like to use a particular older version of LLVM-AIE? @fifield