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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - bug in code generation for aarch64 target reg-to-reg copy"
href="https://bugs.llvm.org/show_bug.cgi?id=46996">46996</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>bug in code generation for aarch64 target reg-to-reg copy
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vhaenel@anaconda.com
</td>
</tr>
<tr>
<th>CC</th>
<td>arnaud.degrandmaison@arm.com, llvm-bugs@lists.llvm.org, smithp352@googlemail.com, Ties.Stuij@arm.com
</td>
</tr></table>
<p>
<div>
<pre>Compile with assertions enabled and then try following reproducer:
```
; ModuleID = 'simplified.ll'
source_filename = "<string>"
target datalayout =
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "aarch64-linux-gnu"
define [3 x { double, i1 }] @"broken"() local_unnamed_addr #0 {
entry:
ret [3 x { double, i1 }] zeroinitializer
}
```
Then reproduce with:
```
llc -march=aarch64 simplified.ll
unimplemented reg-to-reg copy
UNREACHABLE executed at
/Users/vhaenel/git/llvm-project/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:2818!
Stack dump:
0. Program arguments: git/llvm-build-10.0.1/bin/llc -march=aarch64
simplified.ll
1. Running pass 'Function Pass Manager' on module 'simplified.ll'.
2. Running pass 'Post-RA pseudo instruction expansion pass' on function
'@broken'
0 llc 0x0000000106fe4058
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1 llc 0x0000000106fe2df8 llvm::sys::RunSignalHandlers() +
248
2 llc 0x0000000106fe466d SignalHandler(int) + 285
3 libsystem_platform.dylib 0x00007fff7200f5fd _sigtramp + 29
4 libsystem_platform.dylib 0x000000000000004c _sigtramp + 18446603338603498092
5 libsystem_c.dylib 0x00007fff71ee5808 abort + 120
6 llc 0x0000000107aaf68e
llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) + 462
7 llc 0x000000010600f8a8
llvm::AArch64InstrInfo::copyPhysReg(llvm::MachineBasicBlock&,
llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::DebugLoc
const&, llvm::MCRegister, llvm::MCRegister, bool) const + 6856
8 llc 0x000000010647758e (anonymous
namespace)::ExpandPostRA::runOnMachineFunction(llvm::MachineFunction&) + 2942
9 llc 0x000000010656555d
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 349
10 llc 0x00000001068e7928
llvm::FPPassManager::runOnFunction(llvm::Function&) + 1064
11 llc 0x00000001068e7bf8
llvm::FPPassManager::runOnModule(llvm::Module&) + 72
12 llc 0x00000001068e80f2
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 1026
13 llc 0x0000000105aabf53 compileModule(char**,
llvm::LLVMContext&) + 9219
14 llc 0x0000000105aa97bc main + 1404
15 libdyld.dylib 0x00007fff71e16cc9 start + 1
[1] 3621 abort (core dumped) git/llvm-build-10.0.1/bin/llc -march=aarch64
simplified.ll
git/llvm-build-10.0.1/bin/llc -march=aarch64 simplified.ll 0.02s user 9.80s
system 47% cpu 20.569 tot
```</pre>
</div>
</p>
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