Saturated 16 by 32 bit multiply Hi. I'm working on a 55x processor and need an efficient 16 by 32 bit saturated multiply. Since I would like to have my code portable, I don't want to use assembly. I have used the gsm.h / assembly intrinsic. Can anyone help me with a suggestion? I can also use a 32 by 32 bit (saturated) algorithm. Br. Morten
Saturated 16 by 32 bit multiply
Started by ●May 9, 2006
Reply by ●May 10, 20062006-05-10
hi do u require fractional or integer multiplication wht kind of multiplier does 55x have 16x16 ? if it supports 16x16 multiplication then 16x32 mult shld be implemented in 4 instructions x : 16 bit variable y : 32 bit variable temp1 = x * y[0:15] ---(i) temp2 = x * y[16:31] ---(ii) result = saturated addition of temp2<<16 + temp1 if u r going to perform 16x32 mac operation in loop then i will suggest using (i) and (ii) in loop and computation of final result in end after the loop