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Hi all , I need some explanations for the code highlighted below.I got this code from the disassembled window. Here temp is declared as unsigned short and onech is declared as unsigned Char. I would like to know why the compiler is doing the LSL and LSR operations here in this part of the code ,though there is only one LSL I have specified in the code .(ie. (temp^onech) << 8.) Looking for help. T.Sendhilraj 74: unsigned short ans=((temp^onech) << 8); MOV R0,R1 MOV R1,R0,LSL #16 MOV R1,R1,LSR #16 MOV R0,R2 MOV R0,R0,LSL #24 MOV R0,R0,LSR #24 EOR R1,R1,R0 MOV R1,R1,LSL #8 MOV R1,R1,LSL #16 MOV R1,R1,LSR #16
Thanks for your reply . better optimization.... Well throughout my simulation these higlighted code does nothing except shifiting left and right.Do I need these codes really ?.If not,Is it ok if i remove these codes while working for an optimized code?If I am correct these highlighted code occupies 24 bytes. recommend that you are changing to the RealView Compiler.... I dont have a RealView Compiler with me.
Just download the current Demo version from http://www.keil.com/demo
Thanks a lot.