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git.proxmox.com Git - ovs.git/blob - lib/sat-math.h
2 * Copyright (c) 2008 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
23 /* Saturating addition: overflow yields UINT_MAX. */
24 static inline unsigned int
25 sat_add(unsigned int x
, unsigned int y
)
27 return x
+ y
>= x
? x
+ y
: UINT_MAX
;
30 /* Saturating subtraction: underflow yields 0. */
31 static inline unsigned int
32 sat_sub(unsigned int x
, unsigned int y
)
34 return x
>= y
? x
- y
: 0;
37 /* Saturating multiplication: overflow yields UINT_MAX. */
38 static inline unsigned int
39 sat_mul(unsigned int x
, unsigned int y
)
42 : x
<= UINT_MAX
/ y
? x
* y
46 #endif /* sat-math.h */