Analog Devices ADSP-BF53x Blackfin, Reference

Page: 549 / 1042

ADSP-BF53x/BF56x Blackfin Processor Programming Reference 15-37
Arithmetic Operations
Modify – Increment
General Form
de= src_reg
dest_reg = ( src= src_reg_1 )
Syntax
40-Bit Accumulators
A0 += A1 ; /* dest_reg_new = dest_r src_reg, saturate
the result at 40 bits (b) */
A0 += A1 (W32) ; /* dest_reg_new = dest_r src_reg,
signed saturate the result at 32 bits, sign extended (b) */
32-Bit Registers
Preg += Preg (BREV) ; /* dest_reg_new = dest_r
src_reg, bit reversed carry, only (a) */
Ireg += Mreg ( opt_brev ) ; /* dest_reg_new = dest_r
src_reg, optional bit reverse (a) */
Dreg = ( A0 += A1 ) ; /* increment 40-bit A0 by A1 with satura-
tion at 40 bits, then extract the result into a 32-bit register
with saturation at 32 bits (b) */
16-Bit Half-Word Data Registers
Dreg_lo_hi = ( A0 += A1 ) ; /* Increment 40-bit A0 by A1 with
saturation at 40 bits, then extract the result into a half regis-
ter. The extraction step involves first rounding the 40-bit