AMD 250 Manual Do Utilizador

25112

Rev. 3.06

September 2005

REP string with low variable counts 168
unroll small loops 13
unrolling loops 145

memory

dynamic memory allocation 19
pushing memory data 157

MMX™ instructions

PANDN instruction 137
PREFETCHNTA/T0/T1/T2 instructions 105

MOVZX and MOVSX instructions 153
multiplication

by constant 164
multiplies over division, floating-point 238

muxing constructs 136

Nonuniform Memory Access 96

operands

largest possible operand size, repeated string 168

parallelism 35
PF2ID instructions 52
pointers

dereferenced arguments 44
use array-style code instead 10

population-count function 179
prefetch

determining distance 108
multiple 107

PREFETCH and PREFETCHW instructions 104, 106, 108
prototypes 29

recursive functions 132
register reads and writes, partial 81
REP prefix 168

scalar code translated into 3DNow! code 138
scheduling 144
SHLD instruction 85
SHR instruction 85
single-byte near-return RET instruction (opcode C3h) 128
SSE 193, 355
SSE2 193, 355

stack

alignment considerations 122

store-to-load forwarding 20, 22, 100–103
String Instructions 167
string instructions 167
structure (struct) 41, 117, 119
subexpressions, explicitly extract common 37
superscalar processor 251
switch statement 25, 28, 33

unit-stride access 105, 110

write combining 113, 260, 263–264, 266

XOR instruction 169