maleadt
commented
7 months ago That's https://github.com/JuliaLang/julia/pull/41789; you can still access the old disassembling version by (rather crypticly) specifying dump_module=false:
julia> @code_native dump_module=false rand(UInt)
.text
; ┌ @ Random.jl:261 within `rand`
push rbp
mov rbp, rsp
mov rax, qword ptr [r13 + 16]
mov rax, qword ptr [rax + 16]
mov rax, qword ptr [rax]
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:143
; │┌ @ task.jl:182 within `getproperty`
mov rcx, qword ptr [r13 - 56]
mov rsi, qword ptr [r13 - 32]
mov rdi, qword ptr [r13 - 40]
mov rdx, qword ptr [r13 - 48]
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:144
; │┌ @ int.jl:87 within `+`
lea rax, [rsi + rcx]
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:146
; │┌ @ int.jl:536 within `<<` @ int.jl:529
mov r8, rdx
shl r8, 17
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:147
; │┌ @ int.jl:373 within `xor`
xor rdi, rcx
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:148
; │┌ @ int.jl:373 within `xor`
xor rsi, rdx
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:145
; │┌ @ int.jl:372 within `|`
rorx rax, rax, 41
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:149
; │┌ @ int.jl:373 within `xor`
xor rdx, rdi
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:151
; │┌ @ int.jl:373 within `xor`
xor rdi, r8
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:145
; │┌ @ int.jl:87 within `+`
add rax, rcx
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:150
; │┌ @ int.jl:373 within `xor`
xor rcx, rsi
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:152
; │┌ @ int.jl:372 within `|`
rorx rsi, rsi, 19
; │└
; │ @ Random.jl:261 within `rand` @ Random.jl:258 @ Xoshiro.jl:153
; │┌ @ Base.jl:41 within `setproperty!`
mov qword ptr [r13 - 56], rcx
mov qword ptr [r13 - 48], rdx
mov qword ptr [r13 - 40], rdi
mov qword ptr [r13 - 32], rsi
; │└
; │ @ Random.jl:261 within `rand`
pop rbp
ret
; └
; ┌ @ Random.jl:261 within `<invalid>`
nop word ptr [rax + rax]
; └cc @vtjnash
vtjnash
mikmoore
I recently wanted to see the assembly of
rand(UInt), and found this result somewhat disappointing:It's even worse with line wrapping enabled.
1.6 was more ineligible, though it's much longer because MerseneTwister took more instructions than the current RNG.