68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
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//
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// Copyright 2024 CloudWeGo Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package expr
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import (
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`fmt`
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)
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func idiv(v int64, d int64) (int64, error) {
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if d != 0 {
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return v / d, nil
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} else {
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return 0, newRuntimeError("division by zero")
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}
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}
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func imod(v int64, d int64) (int64, error) {
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if d != 0 {
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return v % d, nil
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} else {
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return 0, newRuntimeError("division by zero")
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}
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}
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func ipow(v int64, e int64) (int64, error) {
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mul := v
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ret := int64(1)
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/* value must be 0 or positive */
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if v < 0 {
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return 0, newRuntimeError(fmt.Sprintf("negative base value: %d", v))
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}
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/* exponent must be non-negative */
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if e < 0 {
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return 0, newRuntimeError(fmt.Sprintf("negative exponent: %d", e))
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}
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/* fast power first round */
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if (e & 1) != 0 {
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ret *= mul
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}
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/* fast power remaining rounds */
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for e >>= 1; e != 0; e >>= 1 {
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if mul *= mul; (e & 1) != 0 {
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ret *= mul
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}
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}
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/* all done */
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return ret, nil
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}
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