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merge similar procs regarding digits (#18318)

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flywind 2021-06-22 23:02:32 +08:00 • committed by GitHub
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lib/system/schubfach.nim
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@ -10,6 +10,9 @@
## https://drive.google.com/open?id=1luHhyQF9zKlM8yJ1nebU0OgVYhfC6CBN
## --------------------------------------------------------------------------------------------------
import std/private/digitsutils
template sf_Assert(x: untyped): untyped =
assert(x)
@ -233,33 +236,6 @@ proc toDecimal32(ieeeSignificand: uint32; ieeeExponent: uint32): FloatingDecimal
## ToChars
## ==================================================================================================
proc utoa2Digits(buf: var openArray[char]; pos: int; digits: uint32) {.inline.} =
const
digits100: array[200, char] = ['0', '0', '0', '1', '0', '2', '0', '3', '0', '4', '0', '5',
'0', '6', '0', '7', '0', '8', '0', '9', '1', '0', '1', '1', '1', '2', '1', '3', '1', '4',
'1', '5', '1', '6', '1', '7', '1', '8', '1', '9', '2', '0', '2', '1', '2', '2', '2', '3',
'2', '4', '2', '5', '2', '6', '2', '7', '2', '8', '2', '9', '3', '0', '3', '1', '3', '2',
'3', '3', '3', '4', '3', '5', '3', '6', '3', '7', '3', '8', '3', '9', '4', '0', '4', '1',
'4', '2', '4', '3', '4', '4', '4', '5', '4', '6', '4', '7', '4', '8', '4', '9', '5', '0',
'5', '1', '5', '2', '5', '3', '5', '4', '5', '5', '5', '6', '5', '7', '5', '8', '5', '9',
'6', '0', '6', '1', '6', '2', '6', '3', '6', '4', '6', '5', '6', '6', '6', '7', '6', '8',
'6', '9', '7', '0', '7', '1', '7', '2', '7', '3', '7', '4', '7', '5', '7', '6', '7', '7',
'7', '8', '7', '9', '8', '0', '8', '1', '8', '2', '8', '3', '8', '4', '8', '5', '8', '6',
'8', '7', '8', '8', '8', '9', '9', '0', '9', '1', '9', '2', '9', '3', '9', '4', '9', '5',
'9', '6', '9', '7', '9', '8', '9', '9']
sf_Assert(digits <= 99)
buf[pos] = digits100[2 * digits]
buf[pos+1] = digits100[2 * digits + 1]
proc trailingZeros2Digits(digits: uint32): int32 {.inline.} =
const
trailingZeros100: array[100, int8] = [2'i8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0]
sf_Assert(digits <= 99)
return trailingZeros100[digits]
proc printDecimalDigitsBackwards(buf: var openArray[char]; pos: int; output: uint32): int32 {.inline.} =
var output = output
var pos = pos