| Issue |
144301
|
| Summary |
PDB shows wrong calling convention when compiling static functions on Windows x86
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
momo5502
|
Compiling the following sample for Windows x86 with -O3 shows that `static_func` will have `fastcc` applied to it:
```C++
static __declspec(noinline) int static_func(int arg1){
return arg1 * 2;
}
int main(int argc, char* argv[]) {
return static_func(argc);
}
```
https://godbolt.org/z/Pcroj66c4
The PDB however shows `NearC`, so cdecl, instead of `FastCall`.
The reason this happens is because GlobalOpt updates the CC, but not the debug info:
https://github.com/llvm/llvm-project/blob/aa8a1fa6f515f45db55365b9c1f8453ded24ed32/llvm/lib/Transforms/IPO/GlobalOpt.cpp#L2022
I feel like the `DISubroutineType` should be updated to `DW_CC_BORLAND_msfastcall` for Windows x86. So that the PDB depicts the correct CC.
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