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What is processor?
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Penelope Phippen
April 09, 2016
Technology
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What is processor?
Penelope Phippen
April 09, 2016
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Transcript
What is Processor?
I am @samphippen on all the internets
I do not work for Test Double
But I love them and also @searls
“How would Sam write this code?”
“How would Sam write this code?”
None
This talk is full of convenient lies
None
None
None
None
3.days.ago
new DateTime( System.currentTime() - 3 * 24 * 3600 )
Thinking in terms of the domain
Instead of thinking in terms of the computer
This is one way we can measure abstraction
Amount of computers
None
Amount of computers
SQL Amount of computers
select * from sheep_parts
None
None
None
None
SQL Amount of computers
SQL C Amount of computers
Let’s look at one difference
None
None
None
None
None
None
None
None
Human readable source code at execution time
Interpreted
Compiled
None
(it’s a gnu)
(it’s a gnu)
None
Source code separate at execution time
So why is C “low level”
None
C code does not model modern processors
It models old processors
Modern compilers turn old model assembly into new model assembly
C is not fundamental in any sense
Memory Allocation
Memory access
Memory Release
C Amount of computers
C Assembly Amount of computers
Register Tiny piece of memory in the processor that can
beaccessed very quickly
mov 3, $c mov 4, $d add $c, $d, $a
Operation mov 3, $c mov 4, $d add $c, $d,
$a
Operand mov 3, $c mov 4, $d add $c, $d,
$a
Operand mov 3, $c mov 4, $d add $c, $d,
$a
mov 3, $c mov 4, $d add $c, $d, $a
Operand Register reference
a: nil b: nil c: nil d: nil mov 3,
$c mov 4, $d add $c, $d, $a
a: nil b: nil c: 3 d: nil mov 3,
$c mov 4, $d add $c, $d, $a
a: nil b: nil c: 3 d: nil mov 3,
$c mov 4, $d add $c, $d, $a
a: nil b: nil c: 3 d: 4 mov 3,
$c mov 4, $d add $c, $d, $a
a: nil b: nil c: 3 d: 4 mov 3,
$c mov 4, $d add $c, $d, $a
a: 7 b: nil c: 3 d: 4 mov 3,
$c mov 4, $d add $c, $d, $a
(it’s a gnu)
None
None
None
C Assembly Amount of computers
Assembly Binary Amount of computers
None
0x16 01 00 00 0x33 04 05 01 0x23 81
32 00
Operation 0x16 01 00 00 0x33 04 05 01 0x23
81 32 00
0x16 01 00 00 0x33 04 05 01 0x23 81
32 00 Operand
0x16 01 00 00 0x33 04 05 01 0x23 81
32 00 Operand
Operand 0x16 01 00 00 0x33 04 05 01 0x23
81 32 00
Let’s talk about how machine code gets executed
(one model)
Fetch
Decode
Execute
Retire
FDER
None
None
None
None
None
0: 0x36010000 1: 0x03040501 2: 0x23813200
0: 0x36010000 1: 0x03040501 2: 0x23813200
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: <nil>
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: <nil>
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: 0x36010000
Decode
add 1,2,$c 0x36010283
0x36010283
0x36010283 0x36: add
0x36010283 0x36: add 0x01: value 1
0x36010283 0x36: add 0x01: value 1 0x02: value 2
0x36010283 0x36: add 0x01: value 1 0x02: value 2 0x83:
register 3
None
None
IR: 0x36010283 PC: 0
IR: 0x36010283 PC: 0 A: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
Execute
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 C: <nil>
IR: 0x36010283
IR: 0x36 01 02 83
IR: 0x36 01 02 83
IR: 0x36 01 02 83 +
IR: 0x36 01 02 83 +
IR: 0x36 01 02 83 +
IR: 0x36 01 02 83 10 2 +
IR: 0x36 01 02 83 10 2 +
IR: 0x36 01 02 83 10 2 +
IR: 0x36 01 02 83 10 2 3 +
Retire
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
3
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
3
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
3
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>
3
IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: 3
3
IR: <nil> PC: 1 A: <nil> B: <nil> C: 3
3
None
None
0: 0x36010000 1: 0x03040501 2: 0x23813200
0: 0x36010000 1: 0x03040501 2: 0x23813200
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 1
0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 1
This process repeats
That’s how programs execute (kinda) (I’m still lying to you)
Fetch: get instruction from memory into processor
Decode: prep processor for instruction
Execute: do computation
Retire: results and cleanup
Thanks @samphippen sam@funandplausible.com