Texas Instruments TMS320C67X/C67X+ DSP manual Sptrunc

SPTRUNC Convert Single-Precision Floating-Point Value to Integer With Truncation

				Convert Single-Precision Floating-Point Value to Integer With Truncation
SPTRUNC
Syntax					SPTRUNC (.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 1 0 1 1

1 1 0 s p

3 15511 1

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

Description	The single-precision value in src2 is converted to an integer and placed in dst.
	This instruction operates like SPINT except that the rounding modes in the
	FADCR are ignored, and round toward zero (truncate) is always used.
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 INEX and DEN2 bits are set.

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

3-230 Instruction Set SPRU733