INTEL387TMDX データシートの表示（PDF） - Intel
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INTEL387TMDX Datasheet PDF : 41 Pages
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Intel387TM DX MATH COPROCESSOR
Table 2 3 Condition Code Interpretation after FPREM and FPREM1 Instructions
Condition Code
C2
C3
C1
C0
Interpretation after FPREM and FPREM1
1
X
X
X
Incomplete Reduction
further interation required
for complete reduction
Q1
Q0
Q2
Q MOD8
0
0
0
0
1
0
0
1
1
0
1
0
0
0
0
1
0
1
1
1
0
1
1
1
1
0
1
2
3
4
Complete Reduction
C0 C3 C1 contain three least
significant bits of quotient
5
6
7
Table 2 4 Condition Code Resulting from Comparison
Order
C3
C2
C0
TOP l Operand
0
0
0
TOP k Operand
0
0
1
TOP e Operand
1
0
0
Unordered
1
1
1
Table 2 5 Condition Code Defining Operand Class
C3
C2
C1
C0
Value at TOP
0
0
0
0
a Unsupported
0
0
0
1
a NaN
0
0
1
0
b Unsupported
0
0
1
1
b NaN
0
1
0
0
a Normal
0
1
0
1
a Infinity
0
1
1
0
b Normal
0
1
1
1
b Infinity
1
0
0
0
a0
1
0
0
1
a Empty
1
0
1
0
b0
1
0
1
1
b Empty
1
1
0
0
a Denormal
1
1
1
0
b Denormal
11
11
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