diff --git a/compiler-rt/lib/asan/asan_allocator.h b/compiler-rt/lib/asan/asan_allocator.h
--- a/compiler-rt/lib/asan/asan_allocator.h
+++ b/compiler-rt/lib/asan/asan_allocator.h
@@ -118,43 +118,13 @@
   void OnUnmap(uptr p, uptr size) const;
 };
 
+using SizeClassMap = __sanitizer::AllocatorSizeClassMap;
+
 #if SANITIZER_CAN_USE_ALLOCATOR64
-# if SANITIZER_FUCHSIA
-const uptr kAllocatorSpace = ~(uptr)0;
-const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
-typedef DefaultSizeClassMap SizeClassMap;
-# elif defined(__powerpc64__)
-const uptr kAllocatorSpace = ~(uptr)0;
-const uptr kAllocatorSize  =  0x20000000000ULL;  // 2T.
-typedef DefaultSizeClassMap SizeClassMap;
-# elif defined(__aarch64__) && SANITIZER_ANDROID
-// Android needs to support 39, 42 and 48 bit VMA.
-const uptr kAllocatorSpace =  ~(uptr)0;
-const uptr kAllocatorSize  =  0x2000000000ULL;  // 128G.
-typedef VeryCompactSizeClassMap SizeClassMap;
-# elif defined(__aarch64__)
-// AArch64/SANITIZER_CAN_USE_ALLOCATOR64 is only for 42-bit VMA
-// so no need to different values for different VMA.
-const uptr kAllocatorSpace =  0x10000000000ULL;
-const uptr kAllocatorSize  =  0x10000000000ULL;  // 3T.
-typedef DefaultSizeClassMap SizeClassMap;
-#elif defined(__sparc__)
-const uptr kAllocatorSpace = ~(uptr)0;
-const uptr kAllocatorSize = 0x20000000000ULL;  // 2T.
-typedef DefaultSizeClassMap SizeClassMap;
-# elif SANITIZER_WINDOWS
-const uptr kAllocatorSpace = ~(uptr)0;
-const uptr kAllocatorSize  =  0x8000000000ULL;  // 500G
-typedef DefaultSizeClassMap SizeClassMap;
-# else
-const uptr kAllocatorSpace = 0x600000000000ULL;
-const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
-typedef DefaultSizeClassMap SizeClassMap;
-# endif
 template <typename AddressSpaceViewTy>
 struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
-  static const uptr kSpaceBeg = kAllocatorSpace;
-  static const uptr kSpaceSize = kAllocatorSize;
+  static const uptr kSpaceBeg = __sanitizer::kAllocatorSpace;
+  static const uptr kSpaceSize = __sanitizer::kAllocatorSize;
   static const uptr kMetadataSize = 0;
   typedef __asan::SizeClassMap SizeClassMap;
   typedef AsanMapUnmapCallback MapUnmapCallback;
diff --git a/compiler-rt/lib/lsan/lsan_allocator.h b/compiler-rt/lib/lsan/lsan_allocator.h
--- a/compiler-rt/lib/lsan/lsan_allocator.h
+++ b/compiler-rt/lib/lsan/lsan_allocator.h
@@ -49,51 +49,36 @@
   u32 stack_trace_id;
 };
 
-#if defined(__mips64) || defined(__aarch64__) || defined(__i386__) || \
-    defined(__arm__)
+#if SANITIZER_CAN_USE_ALLOCATOR64
 template <typename AddressSpaceViewTy>
-struct AP32 {
-  static const uptr kSpaceBeg = 0;
-  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+  static const uptr kSpaceBeg = __sanitizer::kAllocatorSpace;
+  static const uptr kSpaceSize = __sanitizer::kAllocatorSize;
   static const uptr kMetadataSize = sizeof(ChunkMetadata);
-  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
-  static const uptr kRegionSizeLog = 20;
-  using AddressSpaceView = AddressSpaceViewTy;
+  typedef __sanitizer::AllocatorSizeClassMap SizeClassMap;
   typedef NoOpMapUnmapCallback MapUnmapCallback;
   static const uptr kFlags = 0;
+  using AddressSpaceView = AddressSpaceViewTy;
 };
 template <typename AddressSpaceView>
-using PrimaryAllocatorASVT = SizeClassAllocator32<AP32<AddressSpaceView>>;
+using PrimaryAllocatorASVT = SizeClassAllocator64<AP64<AddressSpaceView>>;
 using PrimaryAllocator = PrimaryAllocatorASVT<LocalAddressSpaceView>;
-#elif defined(__x86_64__) || defined(__powerpc64__) || defined(__s390x__)
-# if SANITIZER_FUCHSIA
-const uptr kAllocatorSpace = ~(uptr)0;
-const uptr kAllocatorSize  =  0x40000000000ULL;  // 4T.
-# elif defined(__powerpc64__)
-const uptr kAllocatorSpace = 0xa0000000000ULL;
-const uptr kAllocatorSize  = 0x20000000000ULL;  // 2T.
-#elif defined(__s390x__)
-const uptr kAllocatorSpace = 0x40000000000ULL;
-const uptr kAllocatorSize = 0x40000000000ULL;  // 4T.
-# else
-const uptr kAllocatorSpace = 0x600000000000ULL;
-const uptr kAllocatorSize  = 0x40000000000ULL;  // 4T.
-# endif
+#else  // !SANITIZER_CAN_USE_ALLOCATOR64
 template <typename AddressSpaceViewTy>
-struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
-  static const uptr kSpaceBeg = kAllocatorSpace;
-  static const uptr kSpaceSize = kAllocatorSize;
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
   static const uptr kMetadataSize = sizeof(ChunkMetadata);
-  typedef DefaultSizeClassMap SizeClassMap;
+  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = 20;
+  using AddressSpaceView = AddressSpaceViewTy;
   typedef NoOpMapUnmapCallback MapUnmapCallback;
   static const uptr kFlags = 0;
-  using AddressSpaceView = AddressSpaceViewTy;
 };
-
 template <typename AddressSpaceView>
-using PrimaryAllocatorASVT = SizeClassAllocator64<AP64<AddressSpaceView>>;
+using PrimaryAllocatorASVT = SizeClassAllocator32<AP32<AddressSpaceView>>;
 using PrimaryAllocator = PrimaryAllocatorASVT<LocalAddressSpaceView>;
-#endif
+#endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
 template <typename AddressSpaceView>
 using AllocatorASVT = CombinedAllocator<PrimaryAllocatorASVT<AddressSpaceView>>;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h b/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
--- a/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
@@ -76,6 +76,46 @@
 #include "sanitizer_allocator_secondary.h"
 #include "sanitizer_allocator_combined.h"
 
+// The platform-specific default parameters are shared by both
+// asan_allocator.h and lsan_allocator.h.
+#if SANITIZER_CAN_USE_ALLOCATOR64
+#if SANITIZER_FUCHSIA
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize = 0x40000000000ULL;  // 4T.
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#elif defined(__powerpc64__)
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize = 0x20000000000ULL;  // 2T.
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#elif defined(__aarch64__) && SANITIZER_ANDROID
+// Android needs to support 39, 42 and 48 bit VMA.
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize = 0x2000000000ULL;  // 128G.
+using AllocatorSizeClassMap = VeryCompactSizeClassMap;
+#elif defined(__aarch64__)
+// AArch64/SANITIZER_CAN_USE_ALLOCATOR64 is only for 42-bit VMA
+// so no need to different values for different VMA.
+const uptr kAllocatorSpace = 0x10000000000ULL;
+const uptr kAllocatorSize = 0x10000000000ULL;  // 3T.
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#elif defined(__sparc__)
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize = 0x20000000000ULL;  // 2T.
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#elif SANITIZER_WINDOWS
+// On Windows 64-bit there is no easy way to find a large enough fixed address
+// space that is always available. Thus, a dynamically allocated address space
+// is used instead (i.e. ~(uptr)0).
+const uptr kAllocatorSpace = ~(uptr)0;
+const uptr kAllocatorSize = 0x8000000000ULL;  // 500G
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#else
+const uptr kAllocatorSpace = 0x600000000000ULL;
+const uptr kAllocatorSize = 0x40000000000ULL;  // 4T.
+using AllocatorSizeClassMap = DefaultSizeClassMap;
+#endif
+#endif  // SANITIZER_CAN_USE_ALLOCATOR64
+
 } // namespace __sanitizer
 
 #endif // SANITIZER_ALLOCATOR_H
diff --git a/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cpp b/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cpp
--- a/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cpp
+++ b/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cpp
@@ -33,23 +33,11 @@
 
 #if SANITIZER_CAN_USE_ALLOCATOR64
 #if SANITIZER_WINDOWS
-// On Windows 64-bit there is no easy way to find a large enough fixed address
-// space that is always available. Thus, a dynamically allocated address space
-// is used instead (i.e. ~(uptr)0).
-static const uptr kAllocatorSpace = ~(uptr)0;
-static const uptr kAllocatorSize  =  0x8000000000ULL;  // 500G
 static const u64 kAddressSpaceSize = 1ULL << 47;
-typedef DefaultSizeClassMap SizeClassMap;
 #elif SANITIZER_ANDROID && defined(__aarch64__)
-static const uptr kAllocatorSpace = 0x3000000000ULL;
-static const uptr kAllocatorSize  = 0x2000000000ULL;
 static const u64 kAddressSpaceSize = 1ULL << 39;
-typedef VeryCompactSizeClassMap SizeClassMap;
 #else
-static const uptr kAllocatorSpace = 0x700000000000ULL;
-static const uptr kAllocatorSize  = 0x010000000000ULL;  // 1T.
 static const u64 kAddressSpaceSize = 1ULL << 47;
-typedef DefaultSizeClassMap SizeClassMap;
 #endif
 
 template <typename AddressSpaceViewTy>