github.com/matrixorigin/matrixone@v0.7.0/pkg/vectorize/overflow/overflow.go (about)

     1  // Copyright 2021 - 2022 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package overflow
    16  
    17  import (
    18  	"golang.org/x/exp/constraints"
    19  )
    20  
    21  // ------------------------------------add-------------------------------------------
    22  func OverflowUIntAdd[T constraints.Unsigned](a, b, c T) bool {
    23  	return c < a || c < b
    24  }
    25  
    26  func OverflowIntAdd[T constraints.Signed](a, b, c T) bool {
    27  	return (c > a) != (b > 0)
    28  	//or
    29  	//return a > 0 && b > 0 && c < 0 || a < 0 && b < 0 && c > 0
    30  }
    31  
    32  //------------------------------------sub-------------------------------------------
    33  
    34  func OverflowUIntSub[T constraints.Unsigned](a, b, c T) bool {
    35  	return a < b
    36  }
    37  
    38  func OverflowIntSub[T constraints.Signed](a, b, c T) bool {
    39  	return (c < a) != (b > 0)
    40  }