Texas Instruments TMS320C67X/C67X+ DSP manual Instruction Operation and Execution Notations

Instruction Operation and Execution Notations

3.1 Instruction Operation and Execution Notations

	Table 3−1 explains the symbols used in the instruction descriptions.
Table 3−1. Instruction Operation and Execution Notations
Symbol	Meaning
abs(x)	Absolute value of x
and	Bitwise AND
−a	Perform 2s-complement subtraction using the addressing mode defined by the AMR
+a	Perform 2s-complement addition using the addressing mode defined by the AMR
bi	Select bit i of source/destination b
bit_count	Count the number of bits that are 1 in a specified byte
bit_reverse	Reverse the order of bits in a 32-bit register
byte0	8-bit value in the least-significant byte position in 32-bit register (bits 0-7)
byte1	8-bit value in the next to least-significant byte position in 32-bit register (bits 8-15)
byte2	8-bit value in the next to most-significant byte position in 32-bit register (bits 16-23)
byte3	8-bit value in the most-significant byte position in 32-bit register (bits 24-31)
bv2	Bit vector of two flags for s2 or u2 data type
bv4	Bit vector of four flags for s4 or u4 data type
by..z	Selection of bits y through z of bit string b
cond	Check for either creg equal to 0 or creg not equal to 0
creg	3-bit field specifying a conditional register, see section 3.6
cstn	n-bit constant field (for example, cst5)
dint	64-bit integer value (two registers)
dp	Double-precision floating-point register value
dp(x)	Convert x to dp
dst_h or dst_o	msb32 of dst (placed in odd-numbered register of 64-bit register pair)
dst_l or dst_e	lsb32 of dst (placed in even-numbered register of a 64-bit register pair)
dws4	Four packed signed 16-bit integers in a 64-bit register pair
dwu4	Four packed unsigned 16-bit integers in a 64-bit register pair

3-2 Instruction Set SPRU733