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Alternate to https://github.com/nim-lang/Nim/pull/15915 (#15937)

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* Alternate PR to https://github.com/nim-lang/Nim/pull/15915 to
resolve the problem mentioned there (`hash() == 0`) as well as
to close https://github.com/nim-lang/Nim/issues/15624

* Address https://github.com/nim-lang/Nim/pull/15937#discussion_r522759669
{ though this was only a move from 2 copies to 3 copies. ;-) }
This commit is contained in:
c-blake
2020-11-13 08:04:40 -05:00
committed by GitHub
parent 797cb2e67b
commit a9bd4c4e80
1 changed files with 7 additions and 2 deletions
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9
lib/pure/hashes.nim
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@@ -113,8 +113,12 @@ proc hashWangYi1*(x: int64|uint64|Hash): Hash {.inline.} =
const P0 = 0xa0761d6478bd642f'u64
const P1 = 0xe7037ed1a0b428db'u64
const P58 = 0xeb44accab455d165'u64 xor 8'u64
template h(x): untyped = hiXorLo(hiXorLo(P0, uint64(x) xor P1), P58)
when nimvm:
cast[Hash](hiXorLo(hiXorLo(P0, uint64(x) xor P1), P58))
when defined(js): # Nim int64<->JS Number & VM match => JS gets 32-bit hash
result = cast[Hash](h(x)) and cast[Hash](0xFFFFFFFF)
else:
result = cast[Hash](h(x))
else:
when defined(js):
asm """
@@ -132,8 +136,9 @@ proc hashWangYi1*(x: int64|uint64|Hash): Hash {.inline.} =
var res = hi_xor_lo_js(hi_xor_lo_js(P0, BigInt(`x`) ^ P1), P58);
`result` = Number(res & ((BigInt(1) << BigInt(53)) - BigInt(1)));
}"""
result = result and cast[Hash](0xFFFFFFFF)
else:
cast[Hash](hiXorLo(hiXorLo(P0, uint64(x) xor P1), P58))
result = cast[Hash](h(x))
proc hashData*(data: pointer, size: int): Hash =
## Hashes an array of bytes of size `size`.