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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Polybench mm benchmarks with Polly and Wasm backend lead to runtime error"
href="https://bugs.llvm.org/show_bug.cgi?id=50413">50413</a>
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<th>Summary</th>
<td>Polybench mm benchmarks with Polly and Wasm backend lead to runtime error
</td>
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<th>Product</th>
<td>Polly
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Other
</td>
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<th>Assignee</th>
<td>polly-dev@googlegroups.com
</td>
</tr>
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<th>Reporter</th>
<td>manuel.selva@inria.fr
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I am compiling the polybench to WebAssembly using clang. Activating Polly in
this compilation path lead to a runtime error when executing the generated wasm
code for the 2mm, 3mm and gemm benchmarks.
Here is the error, basically the code tries to access memory out of what has
been allocated :
```
╰─ wasmtime 2mm-wasm_polly
Error: failed to run main module `2mm-wasm-polly`
Caused by:
0: failed to invoke command default
1: wasm trap: out of bounds memory access
wasm backtrace:
0: 0x3ec - <unknown>!polybench_alloc_data
1: 0x491 - <unknown>!main
2: 0x456a - <unknown>!__main_void
3: 0x44e2 - <unknown>!__original_main
4: 0x21a - <unknown>!_start
note: run with `WASMTIME_BACKTRACE_DETAILS=1` environment variable to
display more information
```
Note that the error occurs with all the WebAssembly runtimes that we tried.
Maybe the issue is not on the Polly side, but in the WebAssembly backend one. I
didn't found a way to attach this request also to another product so that the
people from the backend could be notified too. Please let me know how to do
that.
Finally, here are some information to reproduce the bug. Please let me know if
I can provide anything else that maybe useful for you to identify what is going
on.
llvm commit : 1fbb484ea45f85740b7450b175096e5fcff6ecd9
compilation command (include and link options omitted) : clang -O3 -mllvm
-polly -2mm.c -DLARGE_DATASET -DPOLYBENCH_TIME --target=wasm32-wasi -o
2mm-wasm-polly
Thank you for the support,
--
Manu</pre>
</div>
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