| ; Licensed to the Apache Software Foundation (ASF) under one or more |
| ; contributor license agreements. See the NOTICE file distributed with |
| ; this work for additional information regarding copyright ownership. |
| ; The ASF licenses this file to You under the Apache License, Version 2.0 |
| ; (the "License"); you may not use this file except in compliance with |
| ; the License. You may obtain a copy of the License at |
| ; |
| ; http://www.apache.org/licenses/LICENSE-2.0 |
| ; |
| ; Unless required by applicable law or agreed to in writing, software |
| ; distributed under the License is distributed on an "AS IS" BASIS, |
| ; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ; See the License for the specific language governing permissions and |
| ; limitations under the License. |
| |
| PUBLIC port_atomic_cas8 |
| |
| _TEXT SEGMENT |
| |
| port_atomic_cas8 PROC |
| |
| ;U_8 port_atomic_cas8(volatile U_8 * data , U_8 value, U_8 comp) |
| ; |
| ; rcx - *data - pointer to the byte which shoud be exchanged |
| ; rdx - value - new value |
| ; r8 - comp - previous conditional value |
| ; |
| ; It's a leaf function so no prolog and epilog are used. |
| |
| mov rax, r8 |
| lock cmpxchg [rcx], dl |
| ret |
| |
| port_atomic_cas8 ENDP |
| |
| _TEXT ENDS |
| |
| END |
| |
