[llvm] [Hexagon] Bugfix in VarArg lowering: Special case for musl (PR #157564)

[Brian Cain via llvm-commits]

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@@ -0,0 +1,15 @@
+; RUN: llc -mtriple=hexagon-unknown-linux-musl < %s | FileCheck %s -check-prefix=MUSL
+; RUN: llc -mtriple=hexagon-unknown-none-elf   < %s | FileCheck %s -check-prefix=NONMUSL
----------------
androm3da wrote:

Instead of (or in addition to?) this test, maybe we should add `RUN` lines to some of the existing vararg tests?

```
$ grep RUN llvm/test/CodeGen/Hexagon/vararg*
llvm/test/CodeGen/Hexagon/vararg_align_check.ll:; RUN: llc -mtriple=hexagon -mcpu=hexagonv62 -mtriple=hexagon-unknown-linux-musl -O0 < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg-deallocate-sp.ll:; RUN: llc -mtriple=hexagon -mtriple=hexagon-unknown-linux-musl < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg_double_onstack.ll:; RUN: llc -mtriple=hexagon -mcpu=hexagonv62 -mtriple=hexagon-unknown-linux-musl -O0 < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg-formal.ll:; RUN: llc -mtriple=hexagon < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg-linux-abi.ll:; RUN: llc -mtriple=hexagon -mtriple=hexagon-unknown-linux-musl < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg.ll:; RUN: llc -mtriple=hexagon -mcpu=hexagonv62 -mtriple=hexagon-unknown-linux-musl -O0 < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/vararg_named.ll:; RUN: llc -mtriple=hexagon -mcpu=hexagonv62 -mtriple=hexagon-unknown-linux-musl -O0 < %s | FileCheck %s
llvm/test/CodeGen/Hexagon/varargs-memv.ll:; RUN: llc -mtriple=hexagon < %s
```

https://github.com/llvm/llvm-project/pull/157564