Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 295)

Subtract Two Signed Integers With Saturation SSUB
3-235 Instruction Set SPRU733
Pipeline
Stage
E1
Read src1, src2
Written dst
Unit in use .L
Instruction Type Single-cycle
Delay Slots 0
See Also SUB
Example 1 SSUB .L2 B1,B2,B3
Before instruction 1 cycle after instruction 2 cycles after instruction
B1 5A2E 51A3h 1512984995 B1 5A2E 51A3h B1 5A2E 51A3h
B2 802A 3FA2h −2144714846 B2 802A 3FA2h B2 802A 3FA2h
B3 xxxx xxxxh B3 7FFF FFFFh 2147483647 B3 7FFF FFFFh
CSR 0001 0100h CSR 0001 0100h CSR 0001 0300h Saturated
Example 2 SSUB .L1 A0,A1,A2
Before instruction 1 cycle after instruction 2 cycles after instruction
A0 4367 71F2h 1130852850 A0 4367 71F2h A0 4367 71F2h
A1 5A2E 51A3h 1512984995 A1 5A2E 51A3h A1 5A2E 51A3h
A2 xxxx xxxxh A2 E939 204Fh −382132145 A2 E939 204Fh
CSR 0001 0100h CSR 0001 0100h CSR 0001 0100h Not saturated
Pipeline