The following are the atomic operations supported by the x86 lock prefix.

ADD, ADC, AND, BTC, BTR, BTS, CMPXCHG, CMPXCH8B, CMPXCHG16B, DEC, INC, NEG, NOT, OR, SBB, SUB, XOR, XADD, and XCHG.

We currently do not provide corresponding operations for BTC, BTR, BTS, NEG, and NOT. ^{1 2}

NEG and NOT don't return the previous value, but can be provided in a way like #47.

• BTS (fetch_bit_set?); done in Add bit_{set,clear,toggle} to Atomic{I,U}* and AtomicPtr #72
• BTR (fetch_bit_reset or fetch_bit_clear?); done in Add bit_{set,clear,toggle} to Atomic{I,U}* and AtomicPtr #72
• BTC (fetch_bit_toggle?); done in Add bit_{set,clear,toggle} to Atomic{I,U}* and AtomicPtr #72
• NEG (fetch_neg, neg); done in Add fetch_neg/neg/fetch_not/not #54
• NOT (fetch_not, not); done in Add fetch_neg/neg/fetch_not/not #54