7-31
FLOATING-POINT UNIT
7.5.FPU INSTRUCTION SET
The floating-point instructions that the IA FPU supports can be grouped into six functional cate-
gories:
Data transfer instructions
Basic arithmetic instructions
Comparison instructions
Transcendental instructions
Load constant instructions
FPU control instructions
Table 7-12. Unsupported Extended-Real Encodings
Class
SignBiased Exponent
Significand
IntegerFraction
Positive
Pseudo-NaNsQuiet
0
.
0
11..11
.
11..11
0
11..11
.
10..00
Signaling
0
.
0
11..11
.
11..11
0
01..11
.
00..01
Positive RealsPseudo-infinity
0
11..11
0
00..00
Unnormals
0
.
0
11..10
.
00..01
0
11..11
.
00..00
Pseudo-denormals0
.
0
00..00
.
00..00
1
11..11
.
00..00
Negative RealsPseudo-denormals1
.
1
00..00
.
00..00
1
11..11
.
00..00
Unnormals
1
.
1
11..10
.
00..01
0
11..01
.
00..00
Pseudo-infinity
1
11..11
0
00..00
Negative
Pseudo-NaNsSignaling
1
.
1
11..11
.
11..11
0
01..11
.
00..01
Quiet
1
.
1
11..11
.
11..11
0
11..11
.
10..00
<
15 bits
®
63 bits
>
