Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 265)

Add Two Signed Integers With Saturation SADD
3-205 Instruction Set SPRU733
Add Two Signed Integers With Saturation SADD
Syntax SADD (.unit) src1, src2, dst
.unit = .L1 or .L2
Compatibility C62x, C64x, 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 src1 x op 1 1 0 s p
3 1 5 5 5 1 7 1 1
Opcode map field used... For operand type... Unit Opfield
src1
src2
dst sint
xsint
sint .L1, .L2 001 0011
src1
src2
dst xsint
slong
slong .L1, .L2 011 0001
src1
src2
dst scst5
xsint
sint .L1, .L2 001 0010
src1
src2
dst scst5
slong
slong .L1, .L2 011 0000
Description src1 is added to src2 and saturated, if an overflow occurs according to the
following rules:
1) If the dst is an int and src1 + src2 > 2 31 − 1, then the result is 2 31 − 1.
2) If the dst is an int and src1 + src2 < −2 31 , then the result is −2 31 .
3) If the dst is a long and src1 + src2 > 2 39 − 1, then the result is 2 39 − 1.
4) If the dst is a long and src1 + src2 < −2 39 , then the result is −2 39 .
The result is placed in dst. If a saturate occurs, the SAT bit in the control status
register (CSR) is set one cycle after dst is written.
Execution if (cond) src1 +s src2 → dst
else nop