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make exp(::Float32) and friends vectorize #44865

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merged 4 commits into from
Apr 13, 2022
Merged

make exp(::Float32) and friends vectorize #44865

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7feac38
make `exp(::Float32)` and friends vectorize
oscardssmith Apr 5, 2022
047234b
fix formatting.
oscardssmith Apr 5, 2022
1c67ec5
respond to review.
oscardssmith Apr 5, 2022
e30db34
more formatting fixes
oscardssmith Apr 6, 2022
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21 changes: 11 additions & 10 deletions base/special/exp.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -275,17 +275,18 @@ end
r = muladd(N_float, LogBU(base, T), x)
r = muladd(N_float, LogBL(base, T), r)
small_part = expb_kernel(base, r)
if !(abs(x) <= SUBNORM_EXP(base, T))
x > MAX_EXP(base, T) && return Inf32
x < MIN_EXP(base, T) && return 0.0f0
if N <= Int32(-24)
twopk = reinterpret(T, (N+Int32(151)) << Int32(23))
return (twopk*small_part)*(2f0^(-24))
end
N == 128 && return small_part * T(2.0) * T(2.0)^127
power = (N+Int32(127))
x > MAX_EXP(base, T) && return Inf32
x < MIN_EXP(base, T) && return 0.0f0
if x <= -SUBNORM_EXP(base, T)
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power += Int32(24)
small_part *= Float32(0x1p-24)
end
twopk = reinterpret(T, (N+Int32(127)) << Int32(23))
return twopk*small_part
if N == 128
power -= Int32(1)
small_part *= 2f0
end
return small_part * reinterpret(T, power << Int32(23))
end

@inline function exp_impl_fast(x::Float32, base)
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