+#elif FOLLY_AARCH64
+ ret =
+ !(__atomic_fetch_or(&lock_, kLockBitMask_, __ATOMIC_SEQ_CST) &
+ kLockBitMask_);
+#elif FOLLY_PPC64
+#define FB_DOBTS(size) \
+ asm volatile("\teieio\n" \
+ "\tl" #size "arx 14,0,%[lockPtr]\n" \
+ "\tli 15,1\n" \
+ "\tsldi 15,15,%[bit]\n" \
+ "\tand. 16,15,14\n" \
+ "\tbne 0f\n" \
+ "\tor 14,14,15\n" \
+ "\tst" #size "cx. 14,0,%[lockPtr]\n" \
+ "\tbne 0f\n" \
+ "\tori %[output],%[output],1\n" \
+ "\tisync\n" \
+ "0:\n" \
+ : [output] "+r" (ret) \
+ : [lockPtr] "r"(&lock_), \
+ [bit] "i" (Bit) \
+ : "cr0", "memory", "r14", "r15", "r16")
+
+ switch (sizeof(IntType)) {
+ case 2: FB_DOBTS(h); break;
+ case 4: FB_DOBTS(w); break;
+ case 8: FB_DOBTS(d); break;
+ }
+
+#undef FB_DOBTS