Texas Instruments TMS320C67X/C67X+ DSP manual Dptrunc, With Truncation

DPTRUNC Convert Double-Precision Floating-Point Value to Integer With Truncation

				Convert Double-Precision Floating-Point Value to Integer
DPTRUNC
				With Truncation
Syntax					DPTRUNC (.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 0 0 0 1

1 1 0 s p

3 15511 1

Opcode map field used...	For operand type...	Unit
src2	dp	.L1, .L2
dst	sint

Description	The 64-bit double-precision value in src2 is converted to an integer and placed
	in dst. This instruction operates like DPINT except that the rounding modes in
	the FADCR are ignored; round toward zero (truncate) is always used. The
	64-bit 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)	int(src2) → dst
	else	nop

Notes:

1)If src2 is NaN, the maximum signed integer (7FFF FFFFh or 8000 0000h) is placed in dst and the INVAL bit is set.

2)If src2 is signed infinity or if overflow occurs, the maximum signed integer

(7FFF FFFFh or 8000 0000h) is placed in dst and the INEX and OVER bits are set. Overflow occurs if src2 is greater than 231 − 1 or less than −231.

3)If src2 is denormalized, 0000 0000h is placed in dst and the INEX and DEN2 bits are set.

4)If rounding is performed, the INEX bit is set.

3-108 Instruction Set SPRU733