Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 268)

SAT Saturate a 40-Bit Integer to a 32-Bit Integer
3-208 Instruction Set SPRU733
Saturate a 40-Bit Integer to a 32-Bit Integer SAT
Syntax SAT (.unit) 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 0 0 0 0 0 x 1 0 0 0 0 0 0 1 1 0 s p
3 1 5 5 1 1 1
Opcode map field used... For operand type... Unit
src2
dst slong
sint .L1, .L2
Description A 40-bit src2 value is converted to a 32-bit value. If the value in src2 is greater
than what can be represented in 32-bits, src2 is saturated. 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) {
if (src2
> (2 31 − 1) )
(2 31 − 1) → dst
else if (src2 < −2 31 )
−2 31 → dst
else src2
31..0
→ dst
}
else nop
Pipeline
Stage
E1
Read src2
Written dst
Unit in use .L
Instruction Type Single-cycle
Delay Slots 0
Pipeline