Rounding (Rnd Instruction) - Texas Instruments TMS320C3x User Manual

5.8 Rounding (RND Instruction)

The RND instruction rounds a number from the extended-precision floating-
point format to the single-precision floating-point format. Rounding is similar to
floating-point addition. Given the number a to be rounded, the following opera-
tion is performed first.
( exp )
c = ( man )
2
Next, a conversion from extended-precision floating-point to single-precision
floating-point format is performed. Given the extended-precision floating-point
value, the rounding, rnd( ), is performed as shown in Figure 5–19.
Note:
RND, src , dst —where ( src ) = 0—does not set the 0 conditions flag (bit 2 in
the status register). Instead, it sets the underflow condition flag (bit 4 in the
status register). When required, check for the underflow condition instead of
the 0 condition.
( exp ) –24
+ (1 2 )
Data Formats and Floating-Point Operation
Rounding (RND Instruction)
5-39