Texas Instruments TMS320C67X/C67X+ DSP manual Cmplt Compare for Less Than, Signed Integers

CMPLT Compare for Less Than, Signed Integers

Description

Execution

Pipeline

Performs a signed comparison of src1 to src2. If src1 is less than src2, then 1 is written to dst; otherwise, 0 is written to dst.

Note:

The CMPLT instruction allows using a 5-bit constant as src1. If src2 is a 5-bit constant, as in

CMPLT .L1 A4, 5, A0

Then to implement this operation, the assembler converts this instruction to

CMPGT .L1 5, A4, A0

These two instructions are equivalent, with the second instruction using the conventional operand types for src1 and src2.

Similarly, the CMPLT instruction allows a cross path operand to be used as src2. If src1 is a cross path operand as in

CMPLT .L1x B4, A5, A0

Then to implement this operation, the assembler converts this instruction to

CMPGT .L1x A5, B4, A0

In both of these operations the listing file (.lst) will have the first implementa- tion, and the second implementation will appear in the debugger.

if (cond)	{
	if (src1 < src2) 1 → dst
	else 0 → dst
	}
else nop
Pipeline	E1
Stage
Read	src1, src2
Written	dst
Unit in use	.L

Instruction Type	Single-cycle
Delay Slots	0
See Also	CMPEQ, CMPGT, CMPLTDP, CMPLTSP, CMPLTU

3-96 Instruction Set SPRU733