Revert r241217, it breaks the build on Windows.

llvm-svn: 241219

2 files changed, 17 insertions, 24 deletions

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_msvc.h b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_msvc.h
index 24d6f0f3442..12ffef3ba10 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_atomic_msvc.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_atomic_msvc.h
@@ -21,15 +21,6 @@ extern "C" void _mm_mfence();
 #pragma intrinsic(_mm_mfence)
 extern "C" void _mm_pause();
 #pragma intrinsic(_mm_pause)
-extern "C" char _InterlockedExchange8(   // NOLINT
-    char volatile *Addend, char Value);  // NOLINT
-#pragma intrinsic(_InterlockedExchange8)
-extern "C" short _InterlockedExchange16(   // NOLINT
-    short volatile *Addend, short Value);  // NOLINT
-#pragma intrinsic(_InterlockedExchange16)
-extern "C" long _InterlockedExchange(    // NOLINT
-    long volatile *Addend, long Value);  // NOLINT
-#pragma intrinsic(_InterlockedExchange)
 extern "C" long _InterlockedExchangeAdd(  // NOLINT
     long volatile * Addend, long Value);  // NOLINT
 #pragma intrinsic(_InterlockedExchangeAdd)
@@ -154,25 +145,28 @@ INLINE u8 atomic_exchange(volatile atomic_uint8_t *a,
     u8 v, memory_order mo) {
   (void)mo;
   DCHECK(!((uptr)a % sizeof(*a)));
-  return (u8)_InterlockedExchange8((volatile char*)&a->val_dont_use, v);
+  __asm {
+    mov eax, a
+    mov cl, v
+    xchg [eax], cl  // NOLINT
+    mov v, cl
+  }
+  return v;
 }
 
 INLINE u16 atomic_exchange(volatile atomic_uint16_t *a,
     u16 v, memory_order mo) {
   (void)mo;
   DCHECK(!((uptr)a % sizeof(*a)));
-  return (u16)_InterlockedExchange16((volatile short*)&a->val_dont_use, v);
-}
-
-INLINE u32 atomic_exchange(volatile atomic_uint32_t *a,
-    u32 v, memory_order mo) {
-  (void)mo;
-  DCHECK(!((uptr)a % sizeof(*a)));
-  return (u32)_InterlockedExchange((volatile long*)&a->val_dont_use, v);
+  __asm {
+    mov eax, a
+    mov cx, v
+    xchg [eax], cx  // NOLINT
+    mov v, cx
+  }
+  return v;
 }
 
-#ifndef _WIN64
-
 INLINE bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
                                            u8 *cmp,
                                            u8 xchgv,
@@ -194,8 +188,6 @@ INLINE bool atomic_compare_exchange_strong(volatile atomic_uint8_t *a,
   return false;
 }
 
-#endif
-
 INLINE bool atomic_compare_exchange_strong(volatile atomic_uintptr_t *a,
                                            uptr *cmp,
                                            uptr xchg,
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index 263dfaf4460..7ddedccb7ce 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -383,7 +383,7 @@ INLINE uptr RoundUpToPowerOfTwo(uptr size) {
   uptr up = MostSignificantSetBitIndex(size);
   CHECK(size < (1ULL << (up + 1)));
   CHECK(size > (1ULL << up));
-  return 1ULL << (up + 1);
+  return 1UL << (up + 1);
 }
 
 INLINE uptr RoundUpTo(uptr size, uptr boundary) {
@@ -659,7 +659,8 @@ void MaybeStartBackgroudThread();
 // memset/memcpy/etc.
 static inline void SanitizerBreakOptimization(void *arg) {
 #if _MSC_VER
-  _ReadWriteBarrier();
+  // FIXME: make sure this is actually enough.
+  __asm;
 #else
   __asm__ __volatile__("" : : "r" (arg) : "memory");
 #endif