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@ -564,12 +564,12 @@ subtypes(Cat) # => 0-element Array{Any,1}
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# AbstractString, as the name implies, is also an abstract type
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subtypes(AbstractString) # 6-element Array{Union{DataType, UnionAll},1}:
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# Base.SubstitutionString
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# Base.Test.GenericString
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# DirectIndexString
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# RevString
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# String
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# SubString
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# Base.SubstitutionString
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# Base.Test.GenericString
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# DirectIndexString
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# RevString
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# String
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# SubString
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# Every type has a super type; use the `supertype` function to get it.
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typeof(5) # => Int64
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@ -709,39 +709,39 @@ square_area(5) #25
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# What happens when we feed square_area an integer?
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code_native(square_area, (Int32,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1 # Prologue
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# movsxd RAX, EDI # Fetch l from memory?
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# imul RAX, RAX # Square l and store the result in RAX
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# pop RBP # Restore old base pointer
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# ret # Result will still be in RAX
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1 # Prologue
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# movsxd RAX, EDI # Fetch l from memory?
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# imul RAX, RAX # Square l and store the result in RAX
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# pop RBP # Restore old base pointer
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# ret # Result will still be in RAX
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code_native(square_area, (Float32,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vmulss XMM0, XMM0, XMM0 # Scalar single precision multiply (AVX)
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# pop RBP
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# ret
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vmulss XMM0, XMM0, XMM0 # Scalar single precision multiply (AVX)
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# pop RBP
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# ret
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code_native(square_area, (Float64,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vmulsd XMM0, XMM0, XMM0 # Scalar double precision multiply (AVX)
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# pop RBP
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# ret
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#
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vmulsd XMM0, XMM0, XMM0 # Scalar double precision multiply (AVX)
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# pop RBP
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# ret
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#
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# Note that julia will use floating point instructions if any of the
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# arguments are floats.
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# Let's calculate the area of a circle
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@ -749,33 +749,33 @@ circle_area(r) = pi * r * r # circle_area (generic function with 1 method)
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circle_area(5) # 78.53981633974483
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code_native(circle_area, (Int32,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vcvtsi2sd XMM0, XMM0, EDI # Load integer (r) from memory
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# movabs RAX, 4593140240 # Load pi
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# vmulsd XMM1, XMM0, QWORD PTR [RAX] # pi * r
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# vmulsd XMM0, XMM0, XMM1 # (pi * r) * r
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# pop RBP
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# ret
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#
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# Source line: 1
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# vcvtsi2sd XMM0, XMM0, EDI # Load integer (r) from memory
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# movabs RAX, 4593140240 # Load pi
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# vmulsd XMM1, XMM0, QWORD PTR [RAX] # pi * r
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# vmulsd XMM0, XMM0, XMM1 # (pi * r) * r
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# pop RBP
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# ret
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#
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code_native(circle_area, (Float64,))
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# movabs RAX, 4593140496
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# Source line: 1
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# vmulsd XMM1, XMM0, QWORD PTR [RAX]
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# vmulsd XMM0, XMM1, XMM0
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# pop RBP
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# ret
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#
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# .section __TEXT,__text,regular,pure_instructions
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# Filename: none
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# Source line: 1
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# push RBP
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# mov RBP, RSP
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# movabs RAX, 4593140496
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# Source line: 1
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# vmulsd XMM1, XMM0, QWORD PTR [RAX]
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# vmulsd XMM0, XMM1, XMM0
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# pop RBP
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# ret
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#
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```
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## Further Reading
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