Compaq ECQD2KCTE manual Index-4

Data stream considerations, A–4

Data structures, shared, 5–6

Data types

byte, 2–1

IEEE floating-point,2–6longword, 2–2longword integer, 2–11quadword, 2–2quadword integer, 2–12unsupported in hardware, 2–12VAX floating-point,2–3word, 2–1

Denormal, 4–64

Denormal operand exception disable, 4–81

Denormal operand exception enable (DNOE) FP_C quadword bit, B–5

Denormal operand status (DNOS) FP_C quadword bit, B–5Denormal operands to zero, 4–81

Depends order (DP), 5–15

DIGITAL UNIX PALcode, instruction summary, C–16

Dirty zero, 4–64

DIV operator, 3–8

DIVF instruction, 4–121

DIVG instruction, 4–121

Division

integer, A–10

performance impact of, A–10Division by zero enable (DZEE)

FP_C quadword bit, B–6Division by zero status (DZES)

FP_C quadword bit, B–5DIVS instruction, 4–122DIVT instruction, 4–122

DNOD bit. See Denormal operand exception disable DNZ. See Denormal operands to zero

DP. See Depends order

DRAINA (PALcode) instruction required, 6–5

draina (PALcode) instruction required, 6–5

DYN bit. See Arithmetic traps, dynamic rounding mode

DZE bit

See also Arithmetic traps, division by zero

DZED bit. See Trap disable bits, division by zero

E

ECB (Evict data cache block) instruction, 4–136CFLUSH (PALcode) instruction with, 4–138

EQV instruction, 4–42

EXCB (exception barrier) instruction, 4–138with FPCR, 4–84

Exception handlers, B–3

TRAPB instruction with, 4–144Exceptions

F31 with, 3–2

R31 with, 3–1EXTBL instruction, 4–51EXTLH instruction, 4–51

EXTLL instruction, 4–51

EXTQH instruction, 4–51

EXTQL instruction, 4–51

Extract byte instructions, 4–51

EXTWH instruction, 4–51

EXTWL instruction, 4–51

F

F_floating data type, 2–3

alignment of, 2–4

compared to IEEE S_floating, 2–8MAX/MIN, 4–65

FBEQ instruction, 4–100FBGE instruction, 4–100FBGT instruction, 4–100FBLE instruction, 4–100FBLT instruction, 4–100FBNE instruction, 4–100FCMOVEQ instruction, 4–107FCMOVGE instruction, 4–107FCMOVGT instruction, 4–107FCMOVLE instruction, 4–107FCMOVLT instruction, 4–107FCMOVNE instruction, 4–107

FETCH (prefetch data) instruction, 4–139

FETCH_M (prefetch data, modify intent) instruction, 4–139

Finite number, Alpha, contrasted with VAX, 4–63Floating-point branch instructions, 4–99

Floating-point control register (FPCR) accessing, 4–82

Index–4