Dpsp – Texas Instruments TMS320C67X/C67X+ DSP User Manual
Page 166
DPSP
Convert Double-Precision Floating-Point Value to Single-Precision Floating-Point Value
3-106
Instruction Set
SPRU733
Convert Double-Precision Floating-Point Value to Single-Precision
Floating-Point Value
DPSP
Syntax
DPSP (.unit) src2, dst
.unit = .L1 or .L2
Compatibility
C67x and C67x+ CPU
Opcode
31
29
28
27
23
22
18
17
13
12
11
5
4
3
2
1
0
creg
z
dst
src2
0 0 0 0 0 x 0 0 0 1 0 0 1 1 1 0 s p
3
1
5
5
1
1
1
Opcode map field used...
For operand type...
Unit
src2
dst
dp
sp
.L1, .L2
Description
The double-precision 64-bit value in src2 is converted to a single-precision
value and placed in dst. The operand is read in one cycle by using the src2 port
for the 32 MSBs and the src1 port for the 32 LSBs.
Execution
if (cond)
sp(src2) → dst
else
nop
Notes:
1) If rounding is performed, the INEX bit is set.
2) If src2 is SNaN, NaN_out is placed in dst and the INVAL and NAN2 bits
are set.
3) If src2 is QNaN, NaN_out is placed in dst and the NAN2 bit is set.
4) If src2 is a signed denormalized number, signed 0 is placed in dst and
the INEX and DEN2 bits are set.
5) If src2 is signed infinity, the result is signed infinity and the INFO bit is set.
6) If overflow occurs, the INEX and OVER bits are set and the results are
set as follows (LFPN is the largest floating-point number):
Overflow Output Rounding Mode
Result Sign
Nearest Even
Zero
+Infinity
−Infinity
+
+infinity
+LFPN
+infinity
+LFPN
−
−infinity
−LFPN
−LFPN
−infinity