Inside the Machine: An Illustrated Introduction to Microprocessors and Computer Architecture (103 page)

fetch stages, on Pentium 4, 155

on Pentium III, 260

next instruction pointer stages,

vector floating-point unit,

on Pentium 4, 155

on G4e, 173

INDEX

291

vector issue queue (VIQ),

write-back stage

for G4e, 146

for G4e, 147

vector logical issue queues, 207

in Pentium pipeline, 84–85

vector permute unit (VPU), 135

write phase of instruction, 37

on G4e, 173

write policies, for caches, 232–233

issue queue for, 211,
212

write-through, 232–233

vectors, vs. scalars, 66,
170

vector simple integer unit,

X

on G4e, 173

vector unit, on G4, 135

x
86 computers

very long instruction word (VLIW)

critical execution path,
151

ISA, 180

drawbacks and benefits, 179

V integer pipe, 87

ISA, 73, 74

VIQ (vector issue queue),

vs. PowerPC ISA, 103–105

for G4e, 146

vs. PowerPC, 136

virtual address space, vs. physical,

registers for, 7

185–186

x
86 instructions

Virtualization Technology

cost of legacy support, 107, 136

(VT-x), 253

decoding in P6 pipeline, 101

Virtual Machine Extensions (VMX),

and IA-64 processors, 180

70, 135, 253

limitations, 84

virtual machine monitor

overhead on Pentium, 91–92

(VMM), 253

trace cache handling of

virtual processor, 253

multi-cycle, 154

VLIW (very long instruction word)

x
86-64, 187–192

ISA, 180

extensions, 180

VMM (virtual machine

Hammer virtual address

monitor), 253

size in, 186

VMX (Virtual Machine Extensions),

programming model,
189

70, 135, 253

switching modes, 189–192

von Neumann, John, 6
n

x
87 computers

VPU.
See
vector permute unit (VPU)

floating-point extensions, 70, 167

VT-x (Virtualization

floating-point registers as stack, 89

Technology), 253

pushing and popping data on

register stack,
90

W

register file, 88

Xeon, 165, 235

Wilkes, Maurice, 6
n

XMM registers, 175

Willamette, 138, 236

wires, 1

Y

Woodcrest, 255

working set, 222

Yonah, 236, 247

write-back, for cache, 233

292

INDEX

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Inside the Machine
was laid out in Adobe FrameMaker. The font families used are New Baskerville for body text, Futura for headings and tables, and Dogma

for titles.

The book was printed and bound at Friesens in Altona, Manitoba in Canada.