[avr-gcc-list] how to infer lsl instruction...

[varsha]

Hello all,

i'm using avr-gcc (GCC) 3.4.3 compiler and Atmega 16 as a MCU.

 

for crc calculation i'm using inline assembly code.

for example..

 

__asm__ __volatile__      
   (           
    "lsl r11"    "\n\t" 
    "rol r12"    "\n\t" 
    "rol r13"    "\n\t" 
    "rol r15"
   );

 

but compiler doesn't generate lsl instruction...

it generates something like this..

 

    1514: bb 0c        add r11, r11
    1516: cc 1c        adc r12, r12
    1518: dd 1c        adc r13, r13
    151a: ff 1c        adc r15, r15

 

 

so what should do to if i want compiler to generate lsl instruction.

 

thank you,

 

 

regards,
varsha

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