[llvm-bugs] [Bug 28459] New: musttail does not support vararg function on ARM and PPC32/PPC64

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28459

            Bug ID: 28459
           Summary: musttail does not support vararg function on ARM and
                    PPC32/PPC64
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: yyc1992 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following IR fails with

```
LLVM ERROR: failed to perform tail call elimination on a call site marked
musttail
```

when compiling for `arm`, `ppc32` and `ppc64` but it passes on `x86`, `x64` or
`aarch64`.

```
declare void @g2(i8*, ...)

define void @f2(i8*, ...) {
top:
  musttail call void (i8*, ...) @g2(i8* %0, ...)
  ret void
}
```

I think this should be possible to support on these archs? If there are any
limitation on what arch can support this, it would be worth mentioning in the
langref, which currently doesn't mention any architecture specific limitations.

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