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A
B
DQ
DQ
FLD
FCOMP
FSTSW
,
A
B
A X
NUMERIC PROGRAMMING EXAMPLES
LOAD
A
ONTO
TOP
OF
287
STACK
COMPARE
A:B,
POP
A
STORE
RESULT
TO
CPU
AX
REGISTER
;
CPU
AX
REGISTER
CONTAINS
CONDITION
CODES
(RESULTS
OF
;
COMPARE>
;
LOAD
CONDITION
CODES
INTO
CPU
FLAGS
SAHF
;
;
USE
CONDITIONAL
JUMPS
TO
DETERMINE
ORDERING
OF
A
TO
; B
,
J P
JB
J E
LLU
NOR
D
ERE
D
LLESS
LEQUAL
;
TE
S T
C
2
(P
F>
TE
S T
CO
( C F )
TE
S T
C3
(Z
F)
LG
REA
TE
R :
CO
(C
F>
·
o ,
C3
(
ZF)
·
0
CO
( C F )
·
o ,
C3
(ZF
)
·
1
CO
( C F )
·
1,
C3
(ZF
)
·
0
LLUNORDERED:
C2
(PF)
• 1
Figure 4-1. Conditional Branching for Compares
JUMP
TABLE
FOR
EXAMINE
ROUTINE
FXAM_TBL
DW
POS_UNNORM,
POS_NAN,
NEG_UNNORM,
NEG_NAN,
POS
NORM.
POS_INFINITY,
NEG_NORM,
NEG_INFINITY,
POS_ZERO,
EMPTY,
NE~_Z£RO,
EM
P T
Y,
PO
S_D
E
NOR
M,
EM
P T
Y,
N E
G_D
E
NOR
M,
EM
P T Y
;
EXAMINE
ST
AND
STORE
RESULT
(CONDITION
CODES)
F X A M
FSTSW
AX
Figure 4-2. Conditional Branching for FXAM
4-2