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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Returning i24 results in "UNREACHABLE executed""
href="https://bugs.llvm.org/show_bug.cgi?id=36564">36564</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Returning i24 results in "UNREACHABLE executed"
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: WebAssembly
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
<tr>
<th>CC</th>
<td>dan433584@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If this IR is compiled:
target triple = "wasm32-unknown-unknown-wasm"
define hidden i24 @foo() {
ret i24 0
}
with
llc foo.ll -O0 -filetype=obj
then it will yield:
unexpected return type
UNREACHABLE executed at
/home/alex/code/rust4/src/llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp:252!
LLVMSymbolizer: error reading file: No such file or directory
#0 0x00007fbe4488f45a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x96d45a)
#1 0x00007fbe4488d1fe llvm::sys::RunSignalHandlers()
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x96b1fe)
#2 0x00007fbe4488d372 SignalHandler(int)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x96b372)
#3 0x00007fbe4380b4b0 (/lib/x86_64-linux-gnu/libc.so.6+0x354b0)
#4 0x00007fbe4380b428 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35428)
#5 0x00007fbe4380d02a abort (/lib/x86_64-linux-gnu/libc.so.6+0x3702a)
#6 0x00007fbe4480dfca
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x8ebfca)
#7 0x00007fbe4664a8a4 PlaceMarkers(llvm::MachineFunction&,
llvm::MachineLoopInfo const&, llvm::WebAssemblyInstrInfo const&,
llvm::MachineDominatorTree&, llvm::WebAssemblyFunctionInfo&) [clone
.constprop.103]
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x27288a4)
#8 0x00007fbe4664ad93 (anonymous
namespace)::WebAssemblyCFGStackify::runOnMachineFunction(llvm::MachineFunction&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0x2728d93)
#9 0x00007fbe44b8f515 llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0xc6d515)
#10 0x00007fbe44994473 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0xa72473)
#11 0x00007fbe4499453c llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0xa7253c)
#12 0x00007fbe44993fdd llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/alex/code/rust4/build/x86_64-unknown-linux-gnu/llvm/bin/../lib/libLLVM-6.0.so+0xa71fdd)
#13 0x000000000041924f (llc+0x41924f)
#14 0x000000000040c10d (llc+0x40c10d)
#15 0x00007fbe437f6830 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x20830)
#16 0x000000000040c2c9 (llc+0x40c2c9)
Stack dump:
0. Program arguments: llc bugpoint-reduced-simplified.ll -filetype=obj -O0
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.ll'.
2. Running pass 'WebAssembly CFG Stackify' on function '@foo'
zsh: abort (core dumped) llc bugpoint-reduced-simplified.ll -filetype=obj -O0
This is reduced from a Rust crate, and I'm not actually really sure how an i24
is coming out of rustc (this was in debug mode), but changing the optimization
level with `llc` fixes the issue so I figured it'd be good to report a bug!</pre>
</div>
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