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Canonicalization LLVM Pass

How to build

To build the canonicalization pass,

make llvm_build
make

How to run

Run the LLVM Pass using opt by

./llvm_build/llvm-project-llvmorg-8.0.1/llvm/build/bin/opt  \
-load ./build/libcanonicalization-pass.so \
-canonicalization \
-canon-out "youroutputfile.jsonl" \
< "myinputfile.bc" >/dev/null

The following optional argument can be used:

  • -log-out "mylogfile.json": Create a log file containing metadata.
  • -canondebug: Print debug information to stdout.

How to test

To run test cases of the canonicalization LLVM pass using the locally built LLVM 8.0.1,

make test

To run the canonicalization LLVM pass on the input in tests/global.ir,

make test_sample

The output in tests/canonicalized.jsonl looks something like:

{"code":"define i32 @_F(i32 %a1) {\nb1:\n  %v1 = load i32*, i32** @gv2, align 8\n  %v2 = load i32, i32* %v1, align 4\n  %v3 = add nsw i32 %v2, %a1\n  ret i32 %v3\n}","data":"@gv1 = global i32 123, align 4\n@gv2 = global i32* @gv1, align 8","extern":false,"name":"f0"}

{"code":"define i32 @_F(i32 %a1) {\nb1:\n  %v1 = load i32, i32* getelementptr inbounds ([3 x i32], [3 x i32]* @gv1, i64 0, i64 0), align 4\n  %v2 = add nsw i32 %v1, %a1\n  ret i32 %v2\n}","data":"@gv1 = global [3 x i32] [i32 1, i32 2, i32 3], align 4","extern":false,"name":"f1"}

Log file format

Log files are in the following format:

{"bin_id":"test","dump_time_secs":273.949707705,"no_of_functions":5088,"prep_time_secs":3.1130904769999996}