caio/clang-p2996
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[libc] Use is aligned builtin instead of ptrtoint (#146402)

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Summary:
This avoids a ptrtoint by just using the clang builtin. This is clang
specific but only clang can compile GPU code anyway so I do not bother
with a fallback.
This commit is contained in:
Joseph Huber
2025-07-02 07:03:11 -05:00
committed by GitHub
parent 5fe63ae9a3
commit dea4f3213d
1 changed files with 2 additions and 2 deletions
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4
libc/src/__support/GPU/allocator.cpp
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@@ -541,7 +541,7 @@ void deallocate(void *ptr) {
return; return;
// All non-slab allocations will be aligned on a 2MiB boundary. // All non-slab allocations will be aligned on a 2MiB boundary.
if ((reinterpret_cast<uintptr_t>(ptr) & SLAB_ALIGNMENT) == 0) if (__builtin_is_aligned(ptr, SLAB_ALIGNMENT + 1))
return impl::rpc_free(ptr); return impl::rpc_free(ptr);
// The original slab pointer is the 2MiB boundary using the given pointer. // The original slab pointer is the 2MiB boundary using the given pointer.
@@ -556,7 +556,7 @@ void *reallocate(void *ptr, uint64_t size) {
return gpu::allocate(size); return gpu::allocate(size);
// Non-slab allocations are considered foreign pointers so we fail. // Non-slab allocations are considered foreign pointers so we fail.
if ((reinterpret_cast<uintptr_t>(ptr) & SLAB_ALIGNMENT) == 0) if (__builtin_is_aligned(ptr, SLAB_ALIGNMENT + 1))
return nullptr; return nullptr;
// The original slab pointer is the 2MiB boundary using the given pointer. // The original slab pointer is the 2MiB boundary using the given pointer.