A grab bag of latency reductions

base/abstractarray.jl

@@ -803,26 +803,81 @@ end
 ## copy between abstract arrays - generally more efficient
 ## since a single index variable can be used.
 
-copyto!(dest::AbstractArray, src::AbstractArray) =
-    copyto!(IndexStyle(dest), dest, IndexStyle(src), src)
+"""
+    copyto!(dest::AbstractArray, src) -> dest
 
-function copyto!(::IndexStyle, dest::AbstractArray, ::IndexStyle, src::AbstractArray)
-    destinds, srcinds = LinearIndices(dest), LinearIndices(src)
-    isempty(srcinds) || (checkbounds(Bool, destinds, first(srcinds)) && checkbounds(Bool, destinds, last(srcinds))) ||
-        throw(BoundsError(dest, srcinds))
-    @inbounds for i in srcinds
-        dest[i] = src[i]
-    end
-    return dest
+
+Copy all elements from collection `src` to array `dest`, whose length must be greater than
+or equal to the length `n` of `src`. The first `n` elements of `dest` are overwritten,
+the other elements are left untouched.
+
+# Examples
+```jldoctest
+julia> x = [1., 0., 3., 0., 5.];
+
+julia> y = zeros(7);
+
+julia> copyto!(y, x);
+
+julia> y
+7-element Array{Float64,1}:
+ 1.0
+ 0.0
+ 3.0
+ 0.0
+ 5.0
+ 0.0
+ 0.0
+```
+"""
+function copyto!(dest::AbstractArray, src::AbstractArray)
+    isempty(src) && return dest
+    src′ = unalias(dest, src)
+    copyto_unaliased!(IndexStyle(dest), dest, IndexStyle(src′), src′)
+end
+
+function copyto!(deststyle::IndexStyle, dest::AbstractArray, srcstyle::IndexStyle, src::AbstractArray)
+    isempty(src) && return dest
+    src′ = unalias(dest, src)
+    copyto_unaliased!(deststyle, dest, srcstyle, src′)
 end
 
-function copyto!(::IndexStyle, dest::AbstractArray, ::IndexCartesian, src::AbstractArray)
+function copyto_unaliased!(deststyle::IndexStyle, dest::AbstractArray, srcstyle::IndexStyle, src::AbstractArray)
+    isempty(src) && return dest
     destinds, srcinds = LinearIndices(dest), LinearIndices(src)
-    isempty(srcinds) || (checkbounds(Bool, destinds, first(srcinds)) && checkbounds(Bool, destinds, last(srcinds))) ||
+    idf, isf = first(destinds), first(srcinds)
+    Δi = idf - isf
+    (checkbounds(Bool, destinds, isf+Δi) & checkbounds(Bool, destinds, last(srcinds)+Δi)) ||
         throw(BoundsError(dest, srcinds))
-    i = 0
-    @inbounds for a in src
-        dest[i+=1] = a
+    if deststyle isa IndexLinear
+        if srcstyle isa IndexLinear
+            # Single-index implementation
+            @inbounds for i in srcinds
+                dest[i + Δi] = src[i]
+            end
+        else
+            # Dual-index implementation
+            i = idf - 1
+            @inbounds for a in src
+                dest[i+=1] = a
+            end
+        end
+    else
+        iterdest, itersrc = eachindex(dest), eachindex(src)
+        if iterdest == itersrc
+            # Shared-iterator implementation
+            for I in iterdest
+                @inbounds dest[I] = src[I]
+            end
+        else
+            # Dual-iterator implementation
+            ret = iterate(iterdest)
+            @inbounds for a in src
+                idx, state = ret
+                dest[idx] = a
+                ret = iterate(iterdest, state)
+            end
+        end
     end
     return dest
 end

base/array.jl

@@ -249,6 +249,30 @@ function unsafe_copyto!(dest::Ptr{T}, src::Ptr{T}, n) where T
     return dest
 end
 
+
+function _unsafe_copyto!(dest, doffs, src, soffs, n)
+    destp = pointer(dest, doffs)
+    srcp = pointer(src, soffs)
+    @inbounds if destp < srcp || destp > srcp + n
+        for i = 1:n
+            if isassigned(src, soffs + i - 1)
+                dest[doffs + i - 1] = src[soffs + i - 1]
+            else
+                _unsetindex!(dest, doffs + i - 1)
+            end
+        end
+    else
+        for i = n:-1:1
+            if isassigned(src, soffs + i - 1)
+                dest[doffs + i - 1] = src[soffs + i - 1]
+            else
+                _unsetindex!(dest, doffs + i - 1)
+            end
+        end
+    end
+    return dest
+end
+
 """
     unsafe_copyto!(dest::Array, do, src::Array, so, N)
 
@@ -279,37 +303,23 @@ function unsafe_copyto!(dest::Array{T}, doffs, src::Array{T}, soffs, n) where T
               ccall(:jl_array_typetagdata, Ptr{UInt8}, (Any,), src) + soffs - 1,
               n)
     else
-        # handle base-case: everything else above was just optimizations
-        @inbounds if destp < srcp || destp > srcp + n
-            for i = 1:n
-                if isassigned(src, soffs + i - 1)
-                    dest[doffs + i - 1] = src[soffs + i - 1]
-                else
-                    _unsetindex!(dest, doffs + i - 1)
-                end
-            end
-        else
-            for i = n:-1:1
-                if isassigned(src, soffs + i - 1)
-                    dest[doffs + i - 1] = src[soffs + i - 1]
-                else
-                    _unsetindex!(dest, doffs + i - 1)
-                end
-            end
-        end
+        _unsafe_copyto!(dest, doffs, src, soffs, n)
     end
     @_gc_preserve_end t2
     @_gc_preserve_end t1
     return dest
 end
 
+unsafe_copyto!(dest::Array, doffs, src::Array, soffs, n) =
+    _unsafe_copyto!(dest, doffs, src, soffs, n)
+
 """
     copyto!(dest, do, src, so, N)
 
 Copy `N` elements from collection `src` starting at offset `so`, to array `dest` starting at
 offset `do`. Return `dest`.
 """
-function copyto!(dest::Array{T}, doffs::Integer, src::Array{T}, soffs::Integer, n::Integer) where T
+function copyto!(dest::Array, doffs::Integer, src::Array, soffs::Integer, n::Integer)
     n == 0 && return dest
     n > 0 || _throw_argerror()
     if soffs < 1 || doffs < 1 || soffs+n-1 > length(src) || doffs+n-1 > length(dest)
@@ -327,7 +337,7 @@ function _throw_argerror()
     throw(ArgumentError("Number of elements to copy must be nonnegative."))
 end
 
-copyto!(dest::Array{T}, src::Array{T}) where {T} = copyto!(dest, 1, src, 1, length(src))
+copyto!(dest::Array, src::Array) = copyto!(dest, 1, src, 1, length(src))
 
 # N.B: The generic definition in multidimensional.jl covers, this, this is just here
 # for bootstrapping purposes.

base/dict.jl

@@ -378,6 +378,10 @@ end
 
 function setindex!(h::Dict{K,V}, v0, key::K) where V where K
     v = convert(V, v0)
+    setindex!(h, v, key)
+end
+
+function setindex!(h::Dict{K,V}, v::V, key::K) where V where K
     index = ht_keyindex2!(h, key)
 
     if index > 0

base/loading.jl

@@ -715,6 +715,7 @@ function _tryrequire_from_serialized(modkey::PkgId, build_id::UInt64, modpath::U
                 invokelatest(callback, modkey)
             end
             for M in mod::Vector{Any}
+                M = M::Module
                 if PkgId(M) == modkey && module_build_id(M) === build_id
                     return M
                 end

base/logging.jl

@@ -71,6 +71,15 @@ logger type.
 catch_exceptions(logger) = true
 
 
+# Prevent invalidation when packages define custom loggers
+# Using invoke in combination with @nospecialize eliminates backedges to these methods
+function _invoked_shouldlog(logger, level, _module, group, id)
+    @nospecialize
+    invoke(shouldlog, Tuple{typeof(logger), typeof(level), typeof(_module), typeof(group), typeof(id)}, logger, level, _module, group, id)
+end
+
+_invoked_min_enabled_level(@nospecialize(logger)) = invoke(min_enabled_level, Tuple{typeof(logger)}, logger)
+
 
 """
     NullLogger()
@@ -315,7 +324,7 @@ function logmsg_code(_module, file, line, level, message, exs...)
                 id = $id
                 # Second chance at an early bail-out (before computing the message),
                 # based on arbitrary logger-specific logic.
-                if shouldlog(logger, level, _module, group, id)
+                if _invoked_shouldlog(logger, level, _module, group, id)
                     file = $file
                     line = $line
                     try
@@ -374,7 +383,7 @@ struct LogState
     logger::AbstractLogger
 end
 
-LogState(logger) = LogState(LogLevel(min_enabled_level(logger)), logger)
+LogState(logger) = LogState(LogLevel(_invoked_min_enabled_level(logger)), logger)
 
 function current_logstate()
     logstate = current_task().logstate
@@ -391,6 +400,7 @@ end
 end
 
 function with_logstate(f::Function, logstate)
+    @nospecialize
     t = current_task()
     old = t.logstate
     try
@@ -401,7 +411,6 @@ function with_logstate(f::Function, logstate)
     end
 end
 
-
 #-------------------------------------------------------------------------------
 # Control of the current logger and early log filtering
 
@@ -502,7 +511,7 @@ with_logger(logger) do
 end
 ```
 """
-with_logger(f::Function, logger::AbstractLogger) = with_logstate(f, LogState(logger))
+with_logger(@nospecialize(f::Function), logger::AbstractLogger) = with_logstate(f, LogState(logger))
 
 """
     current_logger()

base/multidimensional.jl

@@ -310,6 +310,11 @@ module IteratorsMD
     convert(::Type{CartesianIndices{N,R}}, inds::CartesianIndices{N}) where {N,R} =
         CartesianIndices(convert(R, inds.indices))
 
+    # equality
+    Base.:(==)(a::CartesianIndices{N}, b::CartesianIndices{N}) where N =
+        all(map(==, a.indices, b.indices))
+    Base.:(==)(a::CartesianIndices, b::CartesianIndices) = false
+
     # AbstractArray implementation
     Base.axes(iter::CartesianIndices{N,R}) where {N,R} = map(Base.axes1, iter.indices)
     Base.IndexStyle(::Type{CartesianIndices{N,R}}) where {N,R} = IndexCartesian()
@@ -937,56 +942,6 @@ function fill!(A::AbstractArray{T}, x) where T
     A
 end
 
-"""
-    copyto!(dest::AbstractArray, src) -> dest
-
-
-Copy all elements from collection `src` to array `dest`, whose length must be greater than
-or equal to the length `n` of `src`. The first `n` elements of `dest` are overwritten,
-the other elements are left untouched.
-
-# Examples
-```jldoctest
-julia> x = [1., 0., 3., 0., 5.];
-
-julia> y = zeros(7);
-
-julia> copyto!(y, x);
-
-julia> y
-7-element Array{Float64,1}:
- 1.0
- 0.0
- 3.0
- 0.0
- 5.0
- 0.0
- 0.0
-```
-"""
-copyto!(dest, src)
-
-function copyto!(dest::AbstractArray{T1,N}, src::AbstractArray{T2,N}) where {T1,T2,N}
-    isempty(src) && return dest
-    src′ = unalias(dest, src)
-    # fastpath for equal axes (#34025)
-    if axes(dest) == axes(src)
-        for I in eachindex(IndexStyle(src′,dest), src′)
-            @inbounds dest[I] = src′[I]
-        end
-    # otherwise enforce linear indexing
-    else
-        isrc = eachindex(IndexLinear(), src)
-        idest = eachindex(IndexLinear(), dest)
-        ΔI = first(idest) - first(isrc)
-        checkbounds(dest, last(isrc) + ΔI)
-        for I in isrc
-            @inbounds dest[I + ΔI] = src′[I]
-        end
-    end
-    return dest
-end
-
 function copyto!(dest::AbstractArray{T1,N}, Rdest::CartesianIndices{N},
                   src::AbstractArray{T2,N}, Rsrc::CartesianIndices{N}) where {T1,T2,N}
     isempty(Rdest) && return dest

base/set.jl

@@ -67,6 +67,7 @@ delete!(s::Set, x) = (delete!(s.dict, x); s)
 
 copy(s::Set) = copymutable(s)
 
+copymutable(s::Set{T}) where {T} = Set{T}(s)
 # Set is the default mutable fall-back
 copymutable(s::AbstractSet{T}) where {T} = Set{T}(s)
 

contrib/generate_precompile.jl

@@ -13,6 +13,14 @@ CTRL_C = '\x03'
 UP_ARROW = "\e[A"
 DOWN_ARROW = "\e[B"
 
+hardcoded_precompile_statements = """
+precompile(Tuple{typeof(Base.stale_cachefile), String, String})
+precompile(Tuple{typeof(push!), Set{Module}, Module})
+precompile(Tuple{typeof(push!), Set{Method}, Method})
+precompile(Tuple{typeof(push!), Set{Base.PkgId}, Base.PkgId})
+precompile(Tuple{typeof(setindex!), Dict{String,Base.PkgId}, Base.PkgId, String})
+"""
+
 precompile_script = """
 2+2
 print("")
@@ -152,6 +160,10 @@ function generate_precompile_statements()
             push!(statements, statement)
         end
 
+        for statement in split(hardcoded_precompile_statements, '\n')
+            push!(statements, statement)
+        end
+
         # Create a staging area where all the loaded packages are available
         PrecompileStagingArea = Module()
         for (_pkgid, _mod) in Base.loaded_modules

test/arrayops.jl

@@ -1229,6 +1229,12 @@ end
     R = reshape(A, 2, 2)
     A[R] .= reshape((1:4) .+ 2^30, 2, 2)
     @test A == [2,1,4,3] .+ 2^30
+
+    # unequal dimensionality (see comment in #35714)
+    a = [1 3; 2 4]
+    b = [3, 1, 4, 2]
+    copyto!(view(a, b), a)
+    @test a == [2 1; 4 3]
 end
 
 @testset "Base.mightalias unit tests" begin
@@ -2799,4 +2805,4 @@ end
     showerror(b, err)
     @test String(take!(b)) ==
         "BoundsError: attempt to access 2×2 Array{Float64,2} at index [10, \"bad index\"]"
-end
+end