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Index–12
TRAPB (trap barrier) instruction
described
, 4–144
with FPCR
, 4–84
True result
, 4–64
True zero
, 4–65
U
UMULH instruction, 4–36
with MULQ
, 4–35
UNALIGNED data objects
, 1–8
Unconditional long jump
, 4–23
UNDEFINED operations
, 1–7
Underflow enable (UNFE)
FP_C quadword bit
, B–6
Underflow status (UNFS)
FP_C quadword bit
, B–5
UNDZ bit. See Trap disable bits, underflow to zero
UNF bit
See also Arithmetic traps, underflow
UNFD bit. See Trap disable bits, underflow
UNOP code form
, A–11
UNORDERED memory references
, 5–10
Unpack to bytes instructions
, 4–156
UNPKBL (Unpack bytes to longwords) instruction
,
4–156
UNPKBW (Unpack bytes to words) instruction
,
4–156
UNPREDICTABLE results
, 1–7
Updated datum
, 5–6
V
VAX compatibility instructions, restrictions for,
4–149
VAX compatibility register
, 3–3
VAX floating-point
D_floating
, 2–5
F_floating
, 2–3
G_floating
, 2–4
See also Floating-point instructions
VAX floating-point instructions
add instructions
, 4–110
compare instructionsCMPGEQ instruction,
4–112
convert from integer instructions
, 4–115
convert to integer instructions, 4–114
convert VAX floating format instructions
,
4–116
divide instructions, 4–121
from integer move
, 4–124
function codes for
, C–7
function field format
, 4–87
multiply instructions
, 4–126
operate instructions
, 4–102
square root instructions, 4–128
subtract instructions
, 4–130
VAX rounding modes
, 4–66
Vector instructions
byte and word maximum
, 4–152
byte and word minimum, 4–152
Virtual D-cache
, 5–4
Virtual I-cache
, 5–4
maintaining coherency of
, 5–5
Visibility, defined
, 5–14
W
Waivers, E–1
WH64 (Write hint) instruction
, 4–145
WH64 instruction
lock_flag with
, 4–10
Windows NT Alpha PALcode, instruction summary
,
C–17
WMB (Write memory barrier) instruction
, 4–147
atomic operations with
, 5–8
compared with MB, 4–148
with shared data structures
, 5–9
Word data type
, 2–1
atomic access of
, 5–3
Write buffers, requirements for
, 5–5
Write-back caches, requirements for
, 5–5
wrunique (PALcode) instruction
required recognition of
, 6–4
X
x MOD y operator, 3–8
X_floating data type
, 2–9
alignment of
, 2–10
big-endian format
, 2–10
MAX/MIN
, 4–65