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[stdlib] Integer Prototype: get most signifcant bit

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Swift SVN r31898
This commit is contained in:
Dave Abrahams
2015-09-11 18:40:47 +00:00
parent e726cf0ee6
commit 07c47326cb
2 changed files with 48 additions and 13 deletions
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9
stdlib/public/core/FixedPoint.swift.gyb
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@@ -642,6 +642,15 @@ public func _assumeNonNegative(x: ${Self}) -> ${Self} {
% end
% end
% fixedBitWidths = [2**x for x in range(3, 8) if 2**x <= 2 * word_bits]
% for bits in fixedBitWidths:
@transparent
public func _leadingZeros(x: Builtin.Int${bits}) -> Builtin.Int${bits} {
return Builtin.int_ctlz_Int${bits}(x, true.value)
}
% end
//===--- End loop over all integer types ----------------------------------===//
@available(*, unavailable, renamed="Int")