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[skip ci] Make comment describing add22condh meaningful #21985

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Jun 26, 2017
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[skip ci] Make comment describing add22condh meaningful #21985

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5 changes: 4 additions & 1 deletion base/math.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -716,7 +716,10 @@ end
## rem2pi-related calculations ##

function add22condh(xh::Float64, xl::Float64, yh::Float64, yl::Float64)
# as above, but only compute and return high double
# This algorithm, due to Dekker, computes the sum of
# two double-double numbers and return high double. References:
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returns the

# [1] http://www.digizeitschriften.de/en/dms/img/?PID=GDZPPN001170007
# [2] https://dx.doi.org/10.1007/BF01397083
r = xh+yh
s = (abs(xh) > abs(yh)) ? (xh-r+yh+yl+xl) : (yh-r+xh+xl+yl)
zh = r+s
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