[all-commits] [llvm/llvm-project] 000f2b: [X86_64] fix arg pass error in struct. (#86902)

[Longsheng Mou via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 000f2b51633d181bf4a5919fc38cf964a83f2091
      https://github.com/llvm/llvm-project/commit/000f2b51633d181bf4a5919fc38cf964a83f2091
  Author: Longsheng Mou <moulongsheng at huawei.com>
  Date:   2024-04-09 (Tue, 09 Apr 2024)

  Changed paths:
    M clang/lib/CodeGen/Targets/X86.cpp
    M clang/test/CodeGen/X86/x86_64-arguments.c

  Log Message:
  -----------
  [X86_64] fix arg pass error in struct. (#86902)

```
typedef long long t67 __attribute__((aligned (4)));
struct s67 {
  int a;
  t67 b;
};
void f67(struct s67 x) {
}
```
When classify:
a: Lo = Integer, Hi = NoClass
b: Lo = Integer, Hi = NoClass
struct S: Lo = Integer, Hi = NoClass

```
define dso_local void @f67(i64 %x.coerce) {
```
In this case, only one i64 register is used when the structure parameter
is transferred, which is obviously incorrect.So we need to treat the
split case specially. fix
https://github.com/llvm/llvm-project/issues/85387.



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