Texas Instruments TMS320C54x, User Manual

Page: 123 / 469

.double/.ldouble
Initialize Double-Precision Floating-Point Value
4-40
Syntax
.double value [, ... , value
n
]
.ldouble value [, ... , value
n
]
Description The .double and .ldouble directives place the IEEE single-precision floating-
point representation of one or more floating-point values into the current sec-
tion. Each value must be a floating-point constant or a symbol that has been
equated to a floating-point constant. Each constant is converted to a floating-
point value in IEEE single-precision 32-bit format. Floating-point constants are
aligned on a word boundary.
The value consists of three fields:
Field Meaning
s A 1-bit sign field
e An 8-bit biased exponent
f A 23-bit fraction
The value is stored most significant word first, least significant word second,
in the following format:
s e f
31 30 23 22 0
When you use .double or .ldouble in a .struct/.endstruct sequence, the direc-
tives define a member’s size; they do not initialize memory. For more informa-
tion about .struct/ .endstruct, see Section 4.9,
Assembly-Time Symbol
Directives, on page 4-21.
Example This example shows the .double and .ldouble directives.
1 000000 E904 .double –1.0e25
000001 5951
2 000002 43E4 .ldouble 456.0
000003 0000