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faster randn with ifelse #9126

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Nov 23, 2014
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faster randn with ifelse #9126

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2 changes: 1 addition & 1 deletion base/random.jl
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Original file line number Original file line Diff line number Diff line change
Expand Up @@ -940,7 +940,7 @@ function randmtzig_randn(rng::MersenneTwister=GLOBAL_RNG)
r = randi(rng) r = randi(rng)
rabs = int64(r>>1) # One bit for the sign rabs = int64(r>>1) # One bit for the sign
idx = rabs & 0xFF idx = rabs & 0xFF
x = (r&1 != 0x000000000 ? -rabs : rabs)*wi[idx+1] x = ifelse(r % Bool, -rabs, rabs)*wi[idx+1]
if rabs < ki[idx+1] if rabs < ki[idx+1]
return x # 99.3% of the time we return here 1st try return x # 99.3% of the time we return here 1st try
elseif idx == 0 elseif idx == 0
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