wasm-opt assertion failure at src/passes/OptimizeAddedConstants.cpp:289

[merlinsun]

Hello,
I've encountered an assertion failure when running wasm-opt on a specific file using the --optimize-added-constants option.
Here are the details:

$ wasm-opt small.wasm --optimize-added-constants -o test.opt.wasm
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
wasm-opt: /b/s/w/ir/cache/builder/emscripten-releases/binaryen/src/passes/OptimizeAddedConstants.cpp:289: void wasm::OptimizeAddedConstants::doWalkFunction(Function *): Assertion `getPassOptions().lowMemoryUnused' failed.
Aborted (core dumped)
$ wasm-opt --version
wasm-opt version 116 (version_116-293-gfeb8f2412)

This issue was observed on Ubuntu 20.04.

[kripken]

Apologies for the unclear error message, but it is asserting that lowMemoryUnused is set, which is the --low-memory-unused flag (see wasm-opt --help for what that means, and note that your wasm file must be in the form that works with that, or that particular optimization is unsafe).

[merlinsun]

Thank you!