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right shift is now by default sign preserving (#11322)

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* right shift is now by default sign preserving
* fix hashString and semfold
* enable arithmetic shift right globally for CI
* fix typo
* remove xxx
* use oldShiftRight as flag
* apply feedback
* add changelog entry
This commit is contained in:
Arne Döring 2019-05-29 16:48:00 +02:00 • committed by Andreas Rumpf
commit 88b5dd3362
18 changed files with 211 additions and 187 deletions
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20
compiler/bitsets.nim
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@ -75,20 +75,20 @@ proc bitSetContains(x, y: TBitSet): bool =
const populationCount: array[low(int8)..high(int8), int8] = block:
var arr: array[low(int8)..high(int8), int8]
proc countSetBits(x: int8): int8 =
proc countSetBits(x: uint8): uint8 =
return
( x and 0b00000001'i8) +
((x and 0b00000010'i8) shr 1) +
((x and 0b00000100'i8) shr 2) +
((x and 0b00001000'i8) shr 3) +
((x and 0b00010000'i8) shr 4) +
((x and 0b00100000'i8) shr 5) +
((x and 0b01000000'i8) shr 6) +
((x and 0b10000000'i8) shr 7)
( x and 0b00000001'u8) +
((x and 0b00000010'u8) shr 1) +
((x and 0b00000100'u8) shr 2) +
((x and 0b00001000'u8) shr 3) +
((x and 0b00010000'u8) shr 4) +
((x and 0b00100000'u8) shr 5) +
((x and 0b01000000'u8) shr 6) +
((x and 0b10000000'u8) shr 7)
for it in low(int8)..high(int8):
arr[it] = countSetBits(it)
arr[it] = cast[int8](countSetBits(cast[uint8](it)))
arr