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perpare for more compact bit operations in JS (#16728)

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flywind 2021-01-19 07:57:16 -06:00 • committed by GitHub
commit a0fddfecd4
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2 changed files with 20 additions and 7 deletions
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15
lib/pure/math.nim
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@ -159,14 +159,15 @@ func isNaN*(x: SomeFloat): bool {.inline, since: (1,5,1).} =
else: result = c_isnan(x)
when defined(js):
import std/private/jsutils
proc toBitsImpl(x: float): array[2, uint32] =
asm """
const buffer = new ArrayBuffer(8);
const floatBuffer = new Float64Array(buffer);
const uintBuffer = new Uint32Array(buffer);
floatBuffer[0] = `x`;
`result` = uintBuffer
"""
let buffer = newArrayBuffer(8)
let floatBuffer = newFloat64Array(buffer)
let uintBuffer = newUint32Array(buffer)
floatBuffer[0] = x
{.emit: "`result` = `uintBuffer`;".}
# result = cast[array[2, uint32]](uintBuffer)
proc signbit*(x: SomeFloat): bool {.inline, since: (1, 5, 1).} =
## Returns true if `x` is negative, false otherwise.