https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98641
Bug ID: 98641
Summary: Feature request: implement pointer alignment builtins
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
We received reports that users found the pointer alignment builtins provided by
LLVM useful in avoiding error-prone casting to and from intptr_t:
https://clang.llvm.org/docs/LanguageExtensions.html#alignment-builtins
It would be great if we could support them in GCC as well.
This would involve implementing:
Type __builtin_align_up(Type value, size_t alignment);
Type __builtin_align_down(Type value, size_t alignment);
bool __builtin_is_aligned(Type value, size_t alignment);
Using these builtins the compiler can also preserve pointer provenance
information more easily.
