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varints: no need for emit (#24585)

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(cherry picked from commit 78835562b1)
This commit is contained in:
Jacek Sieka
2025-01-02 17:26:53 +01:00
committed by narimiran
parent f4009f0957
commit e80884665d
1 changed files with 3 additions and 9 deletions
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12
lib/std/varints.nim
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@@ -107,15 +107,9 @@ proc writeVu64*(z: var openArray[byte], x: uint64): int =
varintWrite32(toOpenArray(z, 5, 8), y)
return 9
proc sar(a, b: int64): int64 {.noinit.} =
{.emit: [result, " = ", a, " >> ", b, ";"].}
proc sal(a, b: int64): int64 {.noinit.} =
{.emit: [result, " = ", a, " << ", b, ";"].}
proc encodeZigzag*(x: int64): uint64 {.inline.} =
uint64(sal(x, 1)) xor uint64(sar(x, 63))
let xu = uint64(x)
(xu shl 1) xor (xu shr 63)
proc decodeZigzag*(x: uint64): int64 {.inline.} =
let casted = cast[int64](x)
result = (`shr`(casted, 1)) xor (-(casted and 1))
cast[int64]((x shr 1) xor (x shl 63))