| Issue |
153526
|
| Summary |
[clang] No way to generate addrspacecast with C++ style cast
|
| Labels |
clang,
c++
|
| Assignees |
|
| Reporter |
choikwa
|
https://godbolt.org/z/zbrTTqMPv demonstrates C++ casts (static_cast, reinterpret_cast, etc) can't be used to generate addrspacecast. Only C style cast is lowered to addrspacecast. This is important for noalias analysis as addrspacecast is needed (vs PtrToInt) for ptr provenance and set appropriate alias.scope.
A typical scenario may be using reinterpret_cast<AS(n) T*>(reinterpret_cast<uintptr_t>(ptr)) but this inadvertently generates PtrToInt and IntToPtr which is considered as 'capturing' the pointer and llvm cannot trace it back to the underlying objects.
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