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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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8
lib/system/alloc.nim
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@ -38,7 +38,7 @@ type
Trunk = object
next: PTrunk # all nodes are connected with this pointer
key: int # start address at bit 0
bits: array[0..IntsPerTrunk-1, int] # a bit vector
bits: array[0..IntsPerTrunk-1, uint] # a bit vector
TrunkBuckets = array[0..255, PTrunk]
IntSet = object
@ -332,21 +332,21 @@ proc contains(s: IntSet, key: int): bool =
var t = intSetGet(s, key shr TrunkShift)
if t != nil:
var u = key and TrunkMask
result = (t.bits[u shr IntShift] and (1 shl (u and IntMask))) != 0
result = (t.bits[u shr IntShift] and (uint(1) shl (u and IntMask))) != 0
else:
result = false
proc incl(a: var MemRegion, s: var IntSet, key: int) =
var t = intSetPut(a, s, key shr TrunkShift)
var u = key and TrunkMask
t.bits[u shr IntShift] = t.bits[u shr IntShift] or (1 shl (u and IntMask))
t.bits[u shr IntShift] = t.bits[u shr IntShift] or (uint(1) shl (u and IntMask))
proc excl(s: var IntSet, key: int) =
var t = intSetGet(s, key shr TrunkShift)
if t != nil:
var u = key and TrunkMask
t.bits[u shr IntShift] = t.bits[u shr IntShift] and not
(1 shl (u and IntMask))
(uint(1) shl (u and IntMask))
iterator elements(t: IntSet): int {.inline.} =
# while traversing it is forbidden to change the set!