[llvm-bugs] [Bug 33297] New: Zero-size byval argument crashes AArch64 isel

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33297

            Bug ID: 33297
           Summary: Zero-size byval argument crashes AArch64 isel
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: code at klickverbot.at
                CC: llvm-bugs at lists.llvm.org

This hits an assert in LLVM 4.0 (also seems to be present in trunk):

---
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64-unknown-linux-gnu"

define i32 @foo([0 x i32]* byval align 4 %bar) {
  ret i32 0
}
---

```
llc: /build/src/llvm/lib/CodeGen/MachineFunction.cpp:824: int
llvm::MachineFrameInfo::CreateFixedObject(uint64_t, int64_t, bool, bool):
Assertion `Size != 0 && "Cannot allocate zero size fixed stack objects!"'
failed.
#0 0x0000000000ea4378 (llc+0xea4378)
Stack dump:
0.      Program arguments: llc test.ll
1.      Running pass 'Function Pass Manager' on module 'test.ll'.
2.      Running pass 'AArch64 Instruction Selection' on function '@foo'
Aborted
```

While the code is not very useful, the backend probably shouldn't assert.

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