[NFC][Sanitizer] Refine the restriction on SizeClassAllocator64::kRegionSize

[Enna1]

This patch replaces the SANITIZER_WORDSIZE / 2 with sizeof(CompactPtrT) * 8, replaces hardcoded 4 with kCompactPtrScale in assertion.

[llvmbot]

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Enna1 (Enna1)

Changes

This patch replaces the SANITIZER_WORDSIZE / 2 with sizeof(CompactPtrT) * 8, replaces hardcoded 4 with kCompactPtrScale in assertion.

---

Full diff: https://github.com/llvm/llvm-project/pull/86270.diff

1 Files Affected:

• (modified) compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h (+2-1)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h
index 34a64f26478fd5..6e73065d7f53c5 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h
@@ -639,7 +639,8 @@ class SizeClassAllocator64 {
   static_assert(kRegionSize >= SizeClassMap::kMaxSize,
                 "Region size exceed largest size");
   // kRegionSize must be <= 2^36, see CompactPtrT.
-  COMPILER_CHECK((kRegionSize) <= (1ULL << (SANITIZER_WORDSIZE / 2 + 4)));
+  COMPILER_CHECK((kRegionSize) <=
+                 (1ULL << (sizeof(CompactPtrT) * 8 + kCompactPtrScale)));
   // Call mmap for user memory with at least this size.
   static const uptr kUserMapSize = 1 << 18;
   // Call mmap for metadata memory with at least this size.