Rename FOLLY_A64 to FOLLY_AARCH64

Summary:
`FOLLY_AARCH64` is more descriptive.
(searching for A64 tells you nothing, searching for aarch64 tells you a lot)

Reviewed By: yfeldblum, andrewjcg

Differential Revision: D5663075

fbshipit-source-id: 8f31fde4aa394f5452305929541af6d38e4d8a37

folly/DiscriminatedPtr.h

@@ -35,7 +35,7 @@
 #include <folly/Portability.h>
 #include <folly/detail/DiscriminatedPtrDetail.h>
 
-#if !FOLLY_X64 && !FOLLY_A64 && !FOLLY_PPC64
+#if !FOLLY_X64 && !FOLLY_AARCH64 && !FOLLY_PPC64
 # error "DiscriminatedPtr is x64, arm64 and ppc64 specific code."
 #endif
 

folly/GroupVarint.h

@@ -27,7 +27,7 @@
 
 #include <folly/Portability.h>
 
-#if FOLLY_X64 || defined(__i386__) || FOLLY_PPC64 || FOLLY_A64
+#if FOLLY_X64 || defined(__i386__) || FOLLY_PPC64 || FOLLY_AARCH64
 #define HAVE_GROUP_VARINT 1
 
 #include <folly/Bits.h>

folly/Math.h

@@ -106,7 +106,7 @@ using IdivResultType = typename std::enable_if<
     decltype(N{1} / D{1})>::type;
 }
 
-#if defined(__arm__) && !FOLLY_A64
+#if defined(__arm__) && !FOLLY_AARCH64
 constexpr auto kIntegerDivisionGivesRemainder = false;
 #else
 constexpr auto kIntegerDivisionGivesRemainder = true;

folly/PackedSyncPtr.h

@@ -23,7 +23,7 @@
 #include <folly/Portability.h>
 #include <folly/SmallLocks.h>
 
-#if !FOLLY_X64 && !FOLLY_PPC64 && !FOLLY_A64
+#if !FOLLY_X64 && !FOLLY_PPC64 && !FOLLY_AARCH64
 #error "PackedSyncPtr is x64, ppc64 or aarch64 specific code."
 #endif
 

folly/PicoSpinLock.h

@@ -50,7 +50,7 @@
 #include <folly/Portability.h>
 #include <folly/detail/Sleeper.h>
 
-#if !FOLLY_X64 && !FOLLY_A64 && !FOLLY_PPC64
+#if !FOLLY_X64 && !FOLLY_AARCH64 && !FOLLY_PPC64
 #error "PicoSpinLock.h is currently x64, aarch64 and ppc64 only."
 #endif
 
@@ -171,7 +171,7 @@ struct PicoSpinLock {
     }
 
 #undef FB_DOBTS
-#elif FOLLY_A64
+#elif FOLLY_AARCH64
     ret =
         !(__atomic_fetch_or(&lock_, kLockBitMask_, __ATOMIC_SEQ_CST) &
           kLockBitMask_);
@@ -254,7 +254,7 @@ struct PicoSpinLock {
     }
 
 #undef FB_DOBTR
-#elif FOLLY_A64
+#elif FOLLY_AARCH64
     __atomic_fetch_and(&lock_, ~kLockBitMask_, __ATOMIC_SEQ_CST);
 #elif FOLLY_PPC64
 #define FB_DOBTR(size)                                 \

folly/Portability.h

@@ -169,9 +169,9 @@ struct alignas(max_align_v) max_align_t {};
 #endif
 
 #if defined(__aarch64__)
-# define FOLLY_A64 1
+# define FOLLY_AARCH64 1
 #else
-# define FOLLY_A64 0
+# define FOLLY_AARCH64 0
 #endif
 
 #if defined (__powerpc64__)
@@ -182,7 +182,7 @@ struct alignas(max_align_v) max_align_t {};
 
 namespace folly {
 constexpr bool kIsArchAmd64 = FOLLY_X64 == 1;
-constexpr bool kIsArchAArch64 = FOLLY_A64 == 1;
+constexpr bool kIsArchAArch64 = FOLLY_AARCH64 == 1;
 constexpr bool kIsArchPPC64 = FOLLY_PPC64 == 1;
 }
 

folly/SmallLocks.h

@@ -37,6 +37,6 @@
 #include <folly/MicroSpinLock.h>
 
 #include <folly/Portability.h>
-#if FOLLY_X64 || FOLLY_A64 || FOLLY_PPC64
+#if FOLLY_X64 || FOLLY_AARCH64 || FOLLY_PPC64
 #include <folly/PicoSpinLock.h>
 #endif

folly/portability/Asm.h

@@ -36,7 +36,7 @@ inline void asm_volatile_pause() {
   ::_mm_pause();
 #elif defined(__i386__) || FOLLY_X64
   asm volatile("pause");
-#elif FOLLY_A64 || defined(__arm__)
+#elif FOLLY_AARCH64 || defined(__arm__)
   asm volatile("yield");
 #elif FOLLY_PPC64
   asm volatile("or 27,27,27");