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Added bitops2.bitWidth

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Zahary Karadjov 2019-07-31 02:00:39 +03:00
parent ff326d686c
commit 81cbc16f15
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stew/bitops2.nim
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@ -346,6 +346,11 @@ func log2trunc*(x: SomeUnsignedInt): int {.inline.} =
else: else:
log2truncNim(x) log2truncNim(x)
template bitWidth*(x: SomeUnsignedInt): int =
## Returns the number of bits needed to write down the
## number `x` in binary. If `x` is zero, the result is 0.
log2trunc(x) + 1
func leadingZeros*(x: SomeInteger): int {.inline.} = func leadingZeros*(x: SomeInteger): int {.inline.} =
## Returns the number of leading zero bits in integer. ## Returns the number of leading zero bits in integer.
## If `x` is zero, result is bitsof(x) ## If `x` is zero, result is bitsof(x)