Use intrinsics for RWSpinLock when on MSVC.

Summary: Closes #261 Reviewed By: @yfeldblum Differential Revision: D2283554 Pulled By: @sgolemon

Use intrinsics for RWSpinLock when on MSVC.
Summary: Closes #261 Reviewed By: @yfeldblum Differential Revision: D2283554 Pulled By: @sgolemon
4b019355 · Orvid King · facebook-github-bot-1 · 7ea0415c · 4b019355
Commit 4b019355 authored Jul 28, 2015 by Orvid King Committed by facebook-github-bot-1 Jul 28, 2015
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folly/RWSpinLock.h folly/RWSpinLock.h +5 -3

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--- a/folly/RWSpinLock.h
+++ b/folly/RWSpinLock.h
@@ -123,10 +123,12 @@ pthread_rwlock_t Read        728698     24us       101ns     7.28ms     194us
 #if defined(__GNUC__) && \
  (defined(__i386) || FOLLY_X64 || \
   defined(ARCH_K8))
-#define RW_SPINLOCK_USE_X86_INTRINSIC_
-#include <x86intrin.h>
+# define RW_SPINLOCK_USE_X86_INTRINSIC_
+# include <x86intrin.h>
+#elif defined(_MSC_VER) && defined(FOLLY_X64)
+# define RW_SPINLOCK_USE_X86_INTRINSIC_
 #else
-#undef RW_SPINLOCK_USE_X86_INTRINSIC_
+# undef RW_SPINLOCK_USE_X86_INTRINSIC_
 #endif

 // iOS doesn't define _mm_cvtsi64_si128 and friends