forked from cerc-io/plugeth
26 lines
616 B
Go
26 lines
616 B
Go
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package math
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import gmath "math"
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/*
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* NOTE: The following methods need to be optimised using either bit checking or asm
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*/
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// SafeSub returns subtraction result and whether overflow occurred.
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func SafeSub(x, y uint64) (uint64, bool) {
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return x - y, x < y
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}
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// SafeAdd returns the result and whether overflow occurred.
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func SafeAdd(x, y uint64) (uint64, bool) {
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return x + y, y > gmath.MaxUint64-x
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}
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// SafeMul returns multiplication result and whether overflow occurred.
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func SafeMul(x, y uint64) (uint64, bool) {
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if x == 0 {
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return 0, false
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}
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return x * y, x != 0 && y != 0 && y > gmath.MaxUint64/x
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}
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