The Art of Assembly Language

E

eager approach to comparing floating-point numbers , 71

EAX, 289

EBCDIC character set, 107

EBP, 290

EBX, 290

ECX, 290

edge of a clock

falling, 150

rising , 150

EDI, 289

EEPROM, 364

effective addresses, 159

efficiency, 6

of packed data, 55

of positional numbering system, 12

of string functions, 112

EISA bus, 338

electronic circuits and Boolean functions, 213

electronic implementation

counters, 223

registers, 222

element

of array, 159, 169

identity, 193

inverse, 193

multidimensional array, 179

ordering, 175

embedded systems, 212

encapsulated data types, 58

encoding

8-, 16-, and 32-bit operands, 292

80 —86 instruction, 279-80

add instruction, 287

add( 5, ax ) , 275

add( al, cl ) , 288

add( cx, dx ) , 274

add( disp, edx ) , 289

add( eax, ecx ) , 288

immediate instruction, 291

direction (D) bit, 282

immediate operands, 291

indexed addressing modes, 159

instruction, 219, 227, 262, 292

operands, 281

source and destination fields, 227

variable-length opcode, 265

jump instruction, 273

machine instructions, 274

mod field, 282

mod-r/m , 283

mov(eax, ebx) , 219

not (ax) , 277

reducing instruction size , 226

reg field, 282

register values for sib , 285

sib base register values, 285

Social Security number packed fields, 61

Y86 instructions, 271, 274

endian

converting, 146

data organization

big, 144

little, 144

machine, 148

end-of-line character, 106

engineering software, 2

English representation of numeric quantities , 10

ENTER key, 103

entries, page, 311

entry cache control bit, 335

enumeration, 395

equality, 70

error accumulation, 68

evaluation, 68

even banks of memory, 140

events, 242

exceptions, 79

excess exponents, 73

excess-127 exponents, 73, 83

excess-1023 exponents, 74

excess-16383 exponents, 74

exclusive-or (XOR), 46

inverse via, 47

operation, 46, 196

execution

concurrent, 243

out-of-order, 253

overlapping, 241

in parallel, 251

pipeline, 245

step-by-step, 229

superscalar, 251

execution units, 229, 252

expandability of CPU design, 261

expansion opcodes (Y86), 272

exponent, 66

biased (excess), 73

excess-127, 73, 83

excess-1023, 74

excess-16383, 74

expressions, 191, 198

Extended Binary Coded Decimal Interchange Code (EBCDIC), 107

extended precision floating-point format, 71, 74

extending instruction set with prefix byte, 279

extension

sign, 27-29

zero, 27-29

external fragmentation

on a hard disk drive, 376

in a memory manager, 323

extracting bit fields, 62