>
> Does this mean `Ptr{UInt32}(1000)` does not alloc any memory?
>
No, in the code_llvm output, the address is received as argument `%0` and
passed to the `load` pseudo-instruction.
The call means "load a UInt32 from address 1000". Please do have a look at
the documentation:
help?> unsafe_load
> search: unsafe_load
> unsafe_load(p::Ptr{T},i::Integer)
> Load a value of type T from the address of the ith element (1-indexed)
> starting at p. This is equivalent to the C expression p[i-1].
> The unsafe prefix on this function indicates that no validation is
> performed on the pointer p to ensure that it is valid. Incorrect
> usage may segfault your program or return garbage answers, in the same
> manner as C.
On Tue, Jan 26, 2016 at 8:13 PM, Bryan Rivera <[email protected]>
wrote:
> julia> @code_llvm unsafe_load( Ptr{UInt32}(1000) )
>
> define i32 @julia_unsafe_load_21205(i32*) {
> top:
> %1 = load i32* %0, align 1
> ret i32 %1
> }
>
>
> Does this mean `Ptr{UInt32}(1000)` does not alloc any memory?
>
> What effect does the 1000 have?
>
