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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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lib/system/gc.nim
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@ -133,7 +133,7 @@ proc extGetCellType(c: pointer): PNimType {.compilerproc.} =
result = usrToCell(c).typ
proc internRefcount(p: pointer): int {.exportc: "getRefcount".} =
result = int(usrToCell(p).refcount) shr rcShift
result = usrToCell(p).refcount shr rcShift
# this that has to equals zero, otherwise we have to round up UnitsPerPage:
when BitsPerPage mod (sizeof(int)*8) != 0: