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What is processor?

Penelope Phippen
April 09, 2016
Technology
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What is processor?

Penelope Phippen

April 09, 2016
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Transcript

  1. What is Processor?

  2. I am @samphippen on all the internets

  3. I do not work for Test Double

  4. But I love them and also @searls

  5. “How would Sam write this code?”

  6. “How would Sam write this code?”

  7. None

  8. This talk is full of convenient lies

  9. None
  10. None
  11. None
  12. None

  13. 3.days.ago

  14. new DateTime( System.currentTime() - 3 * 24 * 3600 )

  15. Thinking in terms of the domain

  16. Instead of thinking in terms of the computer

  17. This is one way we can measure abstraction

  18. Amount of computers

  19. None

  20. Amount of computers

  21. SQL Amount of computers

  22. select * from sheep_parts

  23. None
  24. None
  25. None
  26. None

  27. SQL Amount of computers

  28. SQL C Amount of computers

  29. Let’s look at one difference

  30. None
  31. None
  32. None
  33. None
  34. None
  35. None
  36. None
  37. None

  38. Human readable source code at execution time

  39. Interpreted

  40. Compiled

  41. None

  42. (it’s a gnu)

  43. (it’s a gnu)

  44. None

  45. Source code separate at execution time

  46. So why is C “low level”

  47. None

  48. C code does not model modern processors

  49. It models old processors

  50. Modern compilers turn old model assembly into new model assembly

  51. C is not fundamental in any sense

  52. Memory Allocation

  53. Memory access

  54. Memory Release

  55. C Amount of computers

  56. C Assembly Amount of computers

  57. Register Tiny piece of memory in the processor that can

    beaccessed very quickly

  58. mov 3, $c mov 4, $d add $c, $d, $a

  59. Operation mov 3, $c mov 4, $d add $c, $d,

    $a

  60. Operand mov 3, $c mov 4, $d add $c, $d,

    $a

  61. Operand mov 3, $c mov 4, $d add $c, $d,

    $a

  62. mov 3, $c mov 4, $d add $c, $d, $a

    Operand Register reference

  63. a: nil b: nil c: nil d: nil mov 3,

    $c mov 4, $d add $c, $d, $a

  64. a: nil b: nil c: 3 d: nil mov 3,

    $c mov 4, $d add $c, $d, $a

  65. a: nil b: nil c: 3 d: nil mov 3,

    $c mov 4, $d add $c, $d, $a

  66. a: nil b: nil c: 3 d: 4 mov 3,

    $c mov 4, $d add $c, $d, $a

  67. a: nil b: nil c: 3 d: 4 mov 3,

    $c mov 4, $d add $c, $d, $a

  68. a: 7 b: nil c: 3 d: 4 mov 3,

    $c mov 4, $d add $c, $d, $a

  69. (it’s a gnu)

  70. None
  71. None
  72. None

  73. C Assembly Amount of computers

  74. Assembly Binary Amount of computers

  75. None

  76. 0x16 01 00 00 0x33 04 05 01 0x23 81

    32 00

  77. Operation 0x16 01 00 00 0x33 04 05 01 0x23

    81 32 00

  78. 0x16 01 00 00 0x33 04 05 01 0x23 81

    32 00 Operand

  79. 0x16 01 00 00 0x33 04 05 01 0x23 81

    32 00 Operand

  80. Operand 0x16 01 00 00 0x33 04 05 01 0x23

    81 32 00

  81. Let’s talk about how machine code gets executed

  82. (one model)

  83. Fetch

  84. Decode

  85. Execute

  86. Retire

  87. FDER

  88. None
  89. None
  90. None
  91. None
  92. None

  93. 0: 0x36010000 1: 0x03040501 2: 0x23813200

  94. 0: 0x36010000 1: 0x03040501 2: 0x23813200

  95. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0

  96. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0

  97. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: <nil>

  98. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: <nil>

  99. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 0 IR: 0x36010000

  100. Decode

  101. add 1,2,$c 0x36010283

  102. 0x36010283

  103. 0x36010283 0x36: add

  104. 0x36010283 0x36: add 0x01: value 1

  105. 0x36010283 0x36: add 0x01: value 1 0x02: value 2

  106. 0x36010283 0x36: add 0x01: value 1 0x02: value 2 0x83:

    register 3
  107. None
  108. None

  109. IR: 0x36010283 PC: 0

  110. IR: 0x36010283 PC: 0 A: <nil>

  111. IR: 0x36010283 PC: 0 A: <nil> B: <nil>

  112. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  113. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  114. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  115. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  116. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  117. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  118. Execute

  119. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  120. IR: 0x36010283 PC: 0 C: <nil>

  121. IR: 0x36010283

  122. IR: 0x36 01 02 83

  123. IR: 0x36 01 02 83

  124. IR: 0x36 01 02 83 +

  125. IR: 0x36 01 02 83 +

  126. IR: 0x36 01 02 83 +

  127. IR: 0x36 01 02 83 10 2 +

  128. IR: 0x36 01 02 83 10 2 +

  129. IR: 0x36 01 02 83 10 2 +

  130. IR: 0x36 01 02 83 10 2 3 +

  131. Retire

  132. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

  133. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

    3

  134. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

    3

  135. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

    3

  136. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: <nil>

    3

  137. IR: 0x36010283 PC: 0 A: <nil> B: <nil> C: 3

    3

  138. IR: <nil> PC: 1 A: <nil> B: <nil> C: 3

    3
  139. None
  140. None

  141. 0: 0x36010000 1: 0x03040501 2: 0x23813200

  142. 0: 0x36010000 1: 0x03040501 2: 0x23813200

  143. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 1

  144. 0: 0x36010000 1: 0x03040501 2: 0x23813200 PC: 1

  145. This process repeats

  146. That’s how programs execute (kinda) (I’m still lying to you)

  147. Fetch: get instruction from memory into processor

  148. Decode: prep processor for instruction

  149. Execute: do computation

  150. Retire: results and cleanup

  151. Thanks @samphippen [email protected]