Compaq ECQD2KCTE manual Index-9

N

NaN (Not-a-Number)

conversion to integer, 4–88

copying, generating, propograting, 4–89defined, 2–6

quiet, 4–64signaling, 4–64

NATURALLY ALIGNED data objects, 1–8

Negate stylized code form, A–13

Non-finite number, 4–64

Nonmemory-like behavior, 5–3

NOP, universal (UNOP), A–11

NOT instruction, ORNOT with zero, 4–42NOT operator, 3–9

NOT stylized code form, A–13

O

Opcode qualifiers

default values, 4–3notation, 4–3

See also specific qualifiers Opcodes

common architecture, C–1DIGITAL UNIX PALcode, C–16in numerical order, C–10OpenVMS Alpha PALcode, C–14PALcode in numerical order, C–18reserved, C–21

summary, C–8

unused function codes for, C–21Windows NT Alpha PALcode, C–17 See also Function codes

OpenVMS Alpha PALcode, instruction summary, C–14

Operand expressions, 3–4

Operand notation defined, 3–4

Operand values, 3–4

Operate instruction format

unused function codes with, 3–13Operate instructions

opcodes and format summarized, C–1Operate instructions, convert with integer overflow,

4–78

Operators, instruction format, 3–6

Optimization. See Performance optimizations

OR operator, 3–9

ORNOT instruction, 4–42

Overflow enable (OVFE)

FP_C quadword bit, B–6

Overflow status (OVFS) FP_C quadword bit, B–5

Overlap

with location access constraints, 5–14with processor issue constraints, 5–13with visibility, 5–14

OVF bit

See also Arithmetic traps, overflow

OVFD bit. See Trap disable bits, overflow disable

P

Pack to bytes instructions, 4–155

PALcode

barriers with, 5–22

CALL_PAL instruction, 4–135compared to hardware instructions, 6–1implementation-specific,6–2

instead of microcode, 6–1instruction format, 3–14overview, 6–1recognized instructions, 6–4replacing, 6–3

required, 6–2

required instructions, 6–5running environment, 6–2

special functions function support, 6–2PALcode instructions

opcodes and format summarized, C–1required, C–20

reserved, function codes for, C–20PALcode instructions, required privileged, 6–5PALcode instructions, required unprivileged, 6–5

PALcode opcodes in numerical order, C–18PALcode variation assignments, D–2

PCC_CNT, 3–3 ,4–143

PCC_OFF, 3–3 ,4–143

Performance monitoring, E–3 ,E–9 ,E–23

Performance optimizations

branch prediction, A–2code sequences, A–9data stream, A–4

for I-streams,A–2instruction alignment, A–2instruction scheduling, A–4I-stream density, A–4shared data, A–5

Performance tuning

IMPLVER instruction with, 4–141PERR (Pixel error) instruction, 4–154

Physical address space described, 5–1

PHYSICAL_ADDRESS operator, 3–9

Pipelined implementations, using EXCB instruction

Index–9