[llvm] [X86][GlobalISel] Implement basic varargs for x86_64 Linux (PR #217113)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 139989 tests passed
* 3713 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/X86/GlobalISel/callingconv-varargs.ll</summary>

```
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\llc.exe -mtriple=x86_64-linux-gnu -global-isel < C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\GlobalISel\callingconv-varargs.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\GlobalISel\callingconv-varargs.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llc.exe' -mtriple=x86_64-linux-gnu -global-isel
# .---command stderr------------
# | Assertion failed: (isLoad() || isStore()) && "Not a load/store!", file C:\_work\llvm-project\llvm-project\llvm\lib\CodeGen\MachineOperand.cpp, line 1195
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
# | Stack dump:
# | 0.	Program arguments: c:\\_work\\llvm-project\\llvm-project\\build\\bin\\llc.exe -mtriple=x86_64-linux-gnu -global-isel
# | 1.	Running pass 'Function Pass Manager' on module '<stdin>'.
# | 2.	Running pass 'InstructionSelect' on function '@start_varargs'
# | Exception Code: 0xC000001D
# |  #0 0x00007ff669ccdd86 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x2f3dd86)
# |  #1 0x00007ffc72cebb04 (C:\Windows\System32\ucrtbase.dll+0x7bb04)
# |  #2 0x00007ffc72cecad1 (C:\Windows\System32\ucrtbase.dll+0x7cad1)
# |  #3 0x00007ffc72cee4a1 (C:\Windows\System32\ucrtbase.dll+0x7e4a1)
# |  #4 0x00007ffc72cee6e1 (C:\Windows\System32\ucrtbase.dll+0x7e6e1)
# |  #5 0x00007ff6689369bf (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x1ba69bf)
# |  #6 0x00007ff668936c11 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x1ba6c11)
# |  #7 0x00007ff667d9074c (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x100074c)
# |  #8 0x00007ff668dea908 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x205a908)
# |  #9 0x00007ff66b06abb6 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x42dabb6)
# | #10 0x00007ff66b0608ba (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x42d08ba)
# | #11 0x00007ff667bce91c (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0xe3e91c)
# | #12 0x00007ff667bce291 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0xe3e291)
# | #13 0x00007ff667926229 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0xb96229)
# | #14 0x00007ff6672f28e0 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x5628e0)
# | #15 0x00007ff6672fb15d (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x56b15d)
# | #16 0x00007ff6672f3970 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x563970)
# | #17 0x00007ff666d9545c (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x545c)
# | #18 0x00007ff66b8d5530 (c:\_work\llvm-project\llvm-project\build\bin\llc.exe+0x4b45530)
# | #19 0x00007ffc7d6d4cb0 (C:\Windows\System32\KERNEL32.DLL+0x14cb0)
# | #20 0x00007ffc8937edfb (C:\Windows\SYSTEM32\ntdll.dll+0x7edfb)
# `-----------------------------
# error: command failed with exit status: 0xc000001d
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\GlobalISel\callingconv-varargs.ll'
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\X86\GlobalISel\callingconv-varargs.ll
# `-----------------------------
# error: command failed with exit status: 2

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/217113