<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/117713>117713</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            SIGSEGV on x86-64 platform with clang-trunk when compiling the program with very-large function parameter without optimization
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          wangbo15
      </td>
    </tr>
</table>

<pre>
    On the `x86-64` platform, the following code gets a `SIGSEGV` when compiled with `clang-trunk` without any option.
However, if optimization is enabled (e.g., `-O1`, the program executes and exits normally.

The same code compiles and runs correctly with GCC without any optimization flags. Interestingly, if the size of `a5` is reduced from `38000` to `37000`, the program occasionally runs successfully with clang-trunk.

Here is the minimal reproducer, also in gotblot: https://godbolt.org/z/jz4hj9Pco

```cpp
class type_2 { 
  int a1[252525];
  int a2[252525];
  int a3[252525];
  int a4[252525];
  int a5[38000]; // if change to a5[37000], the program can randomly pass.
} object;
void test(type_2) {}
int main() {
  test(object);
}
```

The `ulimit` of my computer is as follows, where the stack size is `8M`, larger than the `object` (which is about `4.19 MB`) :
```
core file size (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 642079
max locked memory (kbytes, -l) 65536
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority (-r) 0
stack size              (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes              (-u) 642079
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
```
</pre>
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