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RFC: address issue #20882 #20889

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merged 8 commits into from
Mar 10, 2017
Merged

RFC: address issue #20882 #20889

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35b0543
Try to improve x^y Val lowering
ajkeller34 Mar 4, 2017
08c6ccd
Merge branch 'master' into val_lowering
ajkeller34 Mar 4, 2017
75c33fa
Update tests, docstring, NEWS, rename internal_pow to literal_pow
ajkeller34 Mar 5, 2017
e228123
Use struct instead of immutable in tests.
ajkeller34 Mar 5, 2017
09e5b1b
Use top instead of Base.
ajkeller34 Mar 5, 2017
032a0af
literal_pow takes ^ as first argument.
ajkeller34 Mar 5, 2017
07bc45f
Fix an outdated code comment. [skip ci]
ajkeller34 Mar 9, 2017
e703ae4
Change argument name from ^ to f for clarity.
ajkeller34 Mar 9, 2017
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11 changes: 5 additions & 6 deletions base/intfuncs.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -203,8 +203,7 @@ end
# We mark these @inline since if the target is marked @inline,
# we want to make sure that gets propagated,
# even if it is over the inlining threshold.
@inline ^(x, p) = internal_pow(x, p)
@inline internal_pow{p}(x, ::Type{Val{p}}) = x^p
@inline internal_pow{p}(x, ::Type{Val{p}}, z) = z(x,p)

# Restrict inlining to hardware-supported arithmetic types, which
# are fast enough to benefit from inlining. This also makes it
Expand All @@ -214,10 +213,10 @@ const HWNumber = Union{HWReal, Complex{<:HWReal}, Rational{<:HWReal}}

# inference.jl has complicated logic to inline x^2 and x^3 for
# numeric types. In terms of Val we can do it much more simply:
@inline internal_pow(x::HWNumber, ::Type{Val{0}}) = one(x)
@inline internal_pow(x::HWNumber, ::Type{Val{1}}) = x
@inline internal_pow(x::HWNumber, ::Type{Val{2}}) = x*x
@inline internal_pow(x::HWNumber, ::Type{Val{3}}) = x*x*x
@inline internal_pow(x::HWNumber, ::Type{Val{0}}, z::typeof(^)) = one(x)
@inline internal_pow(x::HWNumber, ::Type{Val{1}}, z::typeof(^)) = x
@inline internal_pow(x::HWNumber, ::Type{Val{2}}, z::typeof(^)) = x*x
@inline internal_pow(x::HWNumber, ::Type{Val{3}}, z::typeof(^)) = x*x*x

# b^p mod m

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2 changes: 1 addition & 1 deletion src/julia-syntax.scm
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Expand Up @@ -2057,7 +2057,7 @@

((and (eq? f '^) (length= e 4) (integer? (cadddr e)))
(expand-forms
`(call ^ ,(caddr e) (call (core apply_type) (top Val) ,(cadddr e)))))
`(call (|.| Base (quote internal_pow)) ,(caddr e) (call (core apply_type) (top Val) ,(cadddr e)) ^)))
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We should probably call it literal_pow in this case

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Yes, that does seem like a better name now that it's used this way.


((and (eq? f '*) (length= e 4))
(expand-transposed-op
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