[llvm-bugs] [Bug 38396] New: [AArch64] Assertion failure compiling with -O0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38396

            Bug ID: 38396
           Summary: [AArch64] Assertion failure compiling with -O0
           Product: tools
           Version: trunk
          Hardware: HP
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: cramertaylorj at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 20626
  --> https://bugs.llvm.org/attachment.cgi?id=20626&action=edit
Assertion-triggering bitcode

The attached bitcode (minimized w/ bugpoint) triggers an assertion failure when
compiled with -O0. This was originally reported as
https://github.com/rust-lang/rust/issues/52884, where it was reported as a
regression after rustc upgraded from https://github.com/rust-lang/llvm 509f29
to 036849. A bisection was attempted, but the merge base 1b838d was also bad.

The backtrace is:

```
#0  0x00007ffff6cfbfcf in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff6cfd3fa in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007ffff6cf4e37 in __assert_fail_base () from
/lib/x86_64-linux-gnu/libc.so.6
#3  0x00007ffff6cf4ee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#4  0x000000000622be3a in llvm::IRTranslator::allocateVRegs (this=0x6c59580,
Val=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp:144
#5  0x000000000623029c in llvm::IRTranslator::translateExtractValue
(this=0x6c59580, U=..., 
    MIRBuilder=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp:510
#6  0x0000000006236df6 in llvm::IRTranslator::translate (this=0x6c59580,
Inst=...)
    at
/usr/local/google/home/cramertj/src/llvm/include/llvm/IR/Instruction.def:198
#7  0x000000000623817e in llvm::IRTranslator::runOnMachineFunction
(this=0x6c59580, CurMF=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp:1624
#8  0x0000000004bb96de in llvm::MachineFunctionPass::runOnFunction
(this=0x6c59580, F=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/CodeGen/MachineFunctionPass.cpp:61
#9  0x00000000051dc0e8 in llvm::FPPassManager::runOnFunction (this=0x6c49f10,
F=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/IR/LegacyPassManager.cpp:1586
#10 0x00000000051dc435 in llvm::FPPassManager::runOnModule (this=0x6c49f10,
M=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/IR/LegacyPassManager.cpp:1609
#11 0x00000000051dcc2f in (anonymous namespace)::MPPassManager::runOnModule
(this=0x6c4e8c0, M=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/IR/LegacyPassManager.cpp:1669
#12 0x00000000051dc717 in llvm::legacy::PassManagerImpl::run (this=0x6c36f90,
M=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/IR/LegacyPassManager.cpp:1774
#13 0x00000000051dd181 in llvm::legacy::PassManager::run (this=0x7fffffffd0c0,
M=...)
    at
/usr/local/google/home/cramertj/src/llvm/lib/IR/LegacyPassManager.cpp:1805
#14 0x0000000002bc5c56 in compileModule (argv=0x7fffffffda88, Context=...)
    at /usr/local/google/home/cramertj/src/llvm/tools/llc/llc.cpp:597
#15 0x0000000002bc393f in main (argc=3, argv=0x7fffffffda88)
    at /usr/local/google/home/cramertj/src/llvm/tools/llc/llc.cpp:351
```

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