IR: add "cmpxchg weak" variant to support permitted failure.

[oota-llvm.git] / include / llvm / CodeGen / ISDOpcodes.h

diff --git a/include/llvm/CodeGen/ISDOpcodes.h b/include/llvm/CodeGen/ISDOpcodes.h
index 49891b2934c8ec9d3f558a9a3627a61686ee5aeb..80fb8b2d3a5d8f706573340da539eb440e67419b 100644 (file)
--- a/include/llvm/CodeGen/ISDOpcodes.h
+++ b/include/llvm/CodeGen/ISDOpcodes.h
@@ -619,6 +619,12 @@ namespace ISD {
     /// This corresponds to the cmpxchg instruction.
     ATOMIC_CMP_SWAP,
 
+    /// Val, Success, OUTCHAIN
+    ///     = ATOMIC_CMP_SWAP_WITH_SUCCESS(INCHAIN, ptr, cmp, swap)
+    /// N.b. this is still a strong cmpxchg operation, so
+    /// Success == "Val == cmp".
+    ATOMIC_CMP_SWAP_WITH_SUCCESS,
+
     /// Val, OUTCHAIN = ATOMIC_SWAP(INCHAIN, ptr, amt)
     /// Val, OUTCHAIN = ATOMIC_LOAD_[OpName](INCHAIN, ptr, amt)
     /// For double-word atomic operations: