Computer Hardware User's Guide

Floating-Point Formats
5-13 Data Formats and Floating-Point Operation
Figure 5–12. Converting from Single-Precision Floating-Point Format
to Extended-Precision Floating-Point Format
Single-precision floating-point format
Extended-precision floating-point format
0yxx
yy yxx
31 24 23 22 0
39
32 3031 0
y
y0
87
The 8 LSBs of the mantissa field are filled with 0s.
Figure 5–13. Converting from Extended-Precision Floating-Point Format
to Single-Precision Floating-Point Format
Extended-precision floating-point format
zyxx
39
32 3031 0
y
yz
87
Single-precision floating-point format
yy
y
xx
31 24 23 22 0
The 8 LSBs of the mantissa field are truncated.