2 * Copyright (c) 2008, 2012 Nicira, Inc.
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 of "unsigned int"s: overflow yields UINT_MAX. */
38 #define SAT_MUL(X, Y) \
40 : (X) <= UINT_MAX / (Y) ? (unsigned int) (X) * (unsigned int) (Y) \
42 static inline unsigned int
43 sat_mul(unsigned int x, unsigned int y)
48 #endif /* sat-math.h */