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Index–5
at processor initialization, 4–83
bit descriptions, 4–80
instructions to read/write
, 4–109
operate instructions that use
, 4–102
saving and restoring, 4–83
trap disable bits in
, 4–78
Floating-point convert instructions
, 3–14
Fa field requirements
, 3–14
Floating-point division, performance impact of
,
A–10
Floating-point format, number representation
(encodings)
, 4–65
Floating-point instructions
branch
, 4–99
faults
, 4–62
function field format
, 4–84
introduced, 4–62
memory format
, 4–90
opcodes and format summarized
, C–1
operate, 4–102
rounding modes
, 4–66
terminology
, 4–63
trapping modes, 4–69
traps
, 4–62
Floating-point load instructions
, 4–90
load F_floating
, 4–91
load G_floating
, 4–92
load S_floating
, 4–93
load T_floating, 4–94
with non-finite values
, 4–90
Floating-point operate instructions
, 4–102
add (IEEE)
, 4–111
add (VAX)
, 4–110
compare (IEEE), 4–113
compare (VAX)
, 4–112
conditional move
, 4–107
convert IEEE floating to integer, 4–117
convert integer to IEEE floating
, 4–118
convert integer to integer
, 4–106
convert integer to VAX floating, 4–115
convert S_floating to T_floating
, 4–119
convert T_floating to S_floating
, 4–120
convert VAX floating to integer, 4–114
convert VAX floating to VAX floating
, 4–116
copy sign
, 4–105
divide (IEEE), 4–122
divide (VAX)
, 4–121
format of
, 3–13
from integer moves, 4–124
move from/to FPCR
, 4–109
multiply (IEEE)
, 4–127
multiply (VAX), 4–126
subtract (IEEE)
, 4–131
subtract (VAX)
, 4–130
to integer moves, 4–123
unused function codes with
, 3–14
Floating-point registers
, 3–2
Floating-point single-precision operations
, 4–62
Floating-point store instructions
, 4–90
store F_floating
, 4–95
store G_floating, 4–96
store S_floating
, 4–97
store T_floating
, 4–98
with non-finite values, 4–90
Floating-point support
floating-point control (FP_C) quadword
, B–4
IEEE, 2–6
IEEE standard 754-1985
, 4–88
instruction overview
, 4–62
longword integer, 2–11
operate instructions
, 4–102
optional
, 4–2
quadword integer, 2–12
rounding modes
, 4–66
single-precision operations
, 4–62
trap modes, 4–69
VAX
, 2–3
Floating-point to integer move
, 4–123
Floating-point to integer move instructions
, 3–14
Floating-point trapping modes
, 4–69
See also Arithmetic traps
FNOP code form
, A–11
FP_C quadword
, B–4
FPCR. See Floating-point control register
FTOIS instruction
, 4–123
FTOIT instruction
, 4–123
Function codes
IEEE floating-point
, C–6
in numerical order, C–10
independent floating-point
, C–8
VAX floating-point
, C–7
See also Opcodes
G
G_floating data type, 2–4
alignment of
, 2–5
mapping
, 2–5
MAX/MIN, 4–65
GENTRAP (PALcode) instruction
required recognition of
, 6–4
gentrap (PALcode) instruction
required recognition of
, 6–4
H
HALT (PALcode) instruction
required
, 6–7
halt (PALcode) instruction
required
, 6–7