124
Double-precision Floating-point Instructions
Section 3-14
DOUBLE LOGA-
RITHM
LOGD
@LOGD
859
Calculates the natural (base e) logarithm of the specified double-precision
floating-point data (64 bits) and outputs the result to the result words.
Output
Required
DOUBLE EXPO-
NENTIAL
POWER
PWRD
@PWRD
860
Raises a double-precision floating-point number (64 bits) to the power of
another double-precision floating-point number and outputs the result to
the result words.
Output
Required
DOUBLE SYM-
BOL COMPARI-
SON
LD, AND. or OR
+
=D (335),
<>D (336),
<D (337),
<=D (338),
>D (339),
or >=D (340)
Compares the specified double-precision data (64 bits) and creates an ON
execution condition if the comparison result is true.
Three kinds of symbols can be used with the floating-point symbol com-
parison instructions: LD (Load), AND, and OR.
LD:
Not required
AND or OR:
Required
Instruction
Mnemonic
Code
Symbol/Operand Function Location
Execution
condition
LOGD(859)
S
R
S: 1st source
word
R: 1st result word
PWRD(860)
B
E
R
B: 1st base word
E: 1st exponent
word
R: 1st result word
S1
S2
S1
S1
S2
S1: Comparison data 1
S2: Com
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